Cho mik hỏi bài này thế nào óc sắp nát rồi mà vẫn không nghĩ ra:
1/1x6 + 1/6x11 + 1/11x16 + .... + 1/491x496 + 1/496x501
huhu ai giúp tui zới :((
m =1/5x6 +1/6x7 +1/7x8 +.......+1/75x76
b =1/1x6 +1/6x11 +1/11x16 +1/16x21 + .... +1/91x96
n =5/1x6 +5/6x11 +5/11x16 +5/16x21 +.... +5/91x96
đấy có phải lớp 4 ko đấy
Lớp 4 đó nếu ai ko làm được thì ko phải học sinh giỏi đó nha
bạn lấy đâu ra cái bài này vậy
hơi căng đấy
CMR:1/1x6+1/6x11+1/11x16+....+1/(5n+1)(5n+6)=n+1/5n+6
Gọi A = 1/1.6 + 1/6.11 +...+ 1/(5n+1)(5n+6)
5A = 5/1.6 + 5/6.11 + ... + 5/(5n+1)(5n+6)
=1 - 1/6 + 1/6 - 1/11 + ... + 1/5n+1 - 1/5n+6
=1 - 1/5n+6 =5n+6/5n+6 - 1/5n+6=5n+5 /5n+6
D=3/2^2 x 8/3^2 x 15/4^2 x ........ x 899/30^2 ^ là số mũ
A=1/1x2+1/2x3+...+1/2016x2017
B=1/1x6+1/6x11+........+1/496x501
Mik đang không biết nên viết mở bài của đề văn tả người thân như thế nào .Nghĩ nát óc mới ra từng này chữ .Các bạn đọc rồi góp ý giúp mik nhé .Nếu thấy cả 2 đề không ổn thì các bạn cũng có thể tự viết một mở bài khác do các bạn nghĩ.Xin đừng cop trên mạng ,thank
Mình có 1 bài cho bạn tham khảo ( mình tự viết đó )
Riêng mặt trời chỉ có một mà thôi
Và mẹ em chỉ có một trên đời.
Mỗi khi ngân nga câu hát này ,tôi lại nghĩ về mẹ. Mẹ là người đã dùi dắt em khôn lớn từng ngày. Đối với em , nếu bố là chỗ dựa thì mẹ là người quan trọng nhất.
Ái chà, đúng đề '' tủ'' của tôi rồi
Cách 1:
Tình mẹ- một tình cảm thiêng liêng và cao quý luôn hiện hữu trong mỗi con người dành cho đấng sinh thành của mình '' Lên non mới biết non cao/ Nuôi con mới biết công lao mẹ thầy''. Tình mẹ hiền dành cho chúng ta không thể nói hết bằng lời, và dù cho có đi đâu, ở đâu, thì chắc chắn, sẽ chẳng có một ai chăm sóc và lo lắng cho chúng ta bằng người mẹ kính yêu
Cách 2
Chẳng điều gì có thể thay thế được mẹ dẫu đôi khi mẹ không phải là gười hiểu con nhát, không hiểu con bằng những người bạn cuả con. Có thể, mẹ không cùng suy nghĩ với con, nhưng dù sao, mẹ vẫn là người tuyệt vời nhất khi đã ban cho con hình hài, cuộc sống
Văn không có hay lắm, nhưng mà cao hứng nên viết mấy dòng tặng bạn
Mong là nó sẽ giúp được bạn ít nhiều
Chúc học tốt !
A=5/1x6+5/6x11+5/11x16+5/16x21+...+5/101x106
B=3/1x4+3/4x7+3/7x10+....+3/97x100
C=1/2x7+1/7x12+1/12x17+....+1/97x102
D=1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
E=3/2x4+3/4x6+3/6x8+....+3/98x100
A = \(\dfrac{5}{1.6}\)+\(\dfrac{5}{6.11}\)+\(\dfrac{5}{11.16}\)+\(\dfrac{5}{16.21}\)+...+\(\dfrac{5}{101.106}\)
A = \(\dfrac{1}{1}-\dfrac{1}{6}+\dfrac{1}{6}-\dfrac{1}{11}+...+\dfrac{1}{101}-\dfrac{1}{106}\)
A = \(\dfrac{1}{1}\) - \(\dfrac{1}{106}\)
A = \(\dfrac{105}{106}\)
B = \(\dfrac{3}{1.4}\) +\(\dfrac{3}{4.7}\)+\(\dfrac{3}{7.10}\)+...+\(\dfrac{3}{97.100}\)
B = \(\dfrac{1}{1}-\dfrac{1}{4}+\dfrac{1}{4}-\dfrac{1}{7}-\dfrac{1}{10}+...+\dfrac{1}{97}-\dfrac{1}{100}\)
B = \(\dfrac{1}{1}\) - \(\dfrac{1}{100}\)
B = \(\dfrac{99}{100}\)
C = \(\dfrac{1}{2.7}+\dfrac{1}{7.12}\) + \(\dfrac{1}{12.17}\)+...+ \(\dfrac{1}{97.102}\)
C= \(\dfrac{1}{5}\) \(\times\)( \(\dfrac{5}{2.7}+\dfrac{5}{7.12}+\dfrac{5}{12.17}+...+\dfrac{5}{97.102}\))
C = \(\dfrac{1}{5}\)\(\times\)(\(\dfrac{1}{2}\) - \(\dfrac{1}{7}\) + \(\dfrac{1}{7}\) - \(\dfrac{1}{12}\) + \(\dfrac{1}{12}\) - \(\dfrac{1}{17}\)+...+ \(\dfrac{1}{97}\) - \(\dfrac{1}{102}\))
C = \(\dfrac{1}{5}\) \(\times\)( \(\dfrac{1}{2}\) - \(\dfrac{1}{102}\))
C = \(\dfrac{1}{5}\) \(\times\) \(\dfrac{25}{51}\)
C = \(\dfrac{5}{51}\)
D = \(\dfrac{1}{2}\) + \(\dfrac{1}{6}\) + \(\dfrac{1}{12}\) + \(\dfrac{1}{20}\) + \(\dfrac{1}{30}\) + \(\dfrac{1}{42}\) + \(\dfrac{1}{56}\) + \(\dfrac{1}{72}\)
D = \(\dfrac{1}{1.2}\) + \(\dfrac{1}{2.3}\) + \(\dfrac{1}{3.4}\) + \(\dfrac{1}{4.5}\) + \(\dfrac{1}{5.6}\) + \(\dfrac{1}{6.7}\)+\(\dfrac{1}{7.8}\)+ \(\dfrac{1}{8.9}\)
D = \(\dfrac{1}{1}\) - \(\dfrac{1}{2}\)+\(\dfrac{1}{2}\)-\(\dfrac{1}{3}\)+\(\dfrac{1}{3}\)-\(\dfrac{1}{4}\)+\(\dfrac{1}{4}\)-\(\dfrac{1}{5}\)+\(\dfrac{1}{5}\)-\(\dfrac{1}{6}\)+\(\dfrac{1}{6}\) - \(\dfrac{1}{7}\)+\(\dfrac{1}{7}\)-\(\dfrac{1}{8}\)+\(\dfrac{1}{8}\)-\(\dfrac{1}{9}\)
D = \(\dfrac{1}{1}\) - \(\dfrac{1}{9}\)
D = \(\dfrac{8}{9}\)
E = \(\dfrac{3}{2.4}\)+\(\dfrac{3}{4.6}\)+\(\dfrac{3}{6.8}\)+...+\(\dfrac{3}{98.100}\)
E = \(\dfrac{3}{2}\) \(\times\) ( \(\dfrac{2}{2.4}\) + \(\dfrac{2}{4.6}\)+ \(\dfrac{2}{6.8}\)+...+\(\dfrac{2}{98.100}\))
E = \(\dfrac{3}{2}\)\(\times\)( \(\dfrac{1}{2}\) - \(\dfrac{1}{4}\)+ \(\dfrac{1}{4}\) - \(\dfrac{1}{6}\)+\(\dfrac{1}{6}\)-\(\dfrac{1}{8}\)+...+\(\dfrac{1}{98}\) - \(\dfrac{1}{100}\))
E = \(\dfrac{3}{2}\) \(\times\) ( \(\dfrac{1}{2}\) - \(\dfrac{1}{100}\))
E = \(\dfrac{3}{2}\) \(\times\) \(\dfrac{49}{100}\)
E = \(\dfrac{147}{200}\)
hãy viết bài văn tả sân trường em trong giờ ra choi . giúp mình bài này nhé ! mình nghĩ vắt óc vẫn chưa được 1 chữ nào
Tiếng trống giờ ra chơi đã vang lên bên tai mỗi học sinh. Từ các lớp, học sinh ùa ra như những chú chim non, tò mò muốn bước ra ngoài không gian.
Nắng đuổi bắt chùm lộc non xanh mơn mởn, rồi đứng lại bên những cành phượng vĩ đỏ rực đang khoe sắc. Dưới gốc cây đa già sừng sững, các bạn gái rủ nhau chơi nhảy dây. Những đôi chân xinh xắn ấy, cùng bạn nhảy dây từng bước uyển chuyển. Bạn nào bạn nấy cũng cố gắng nhảy thật nhịp nhàng, để đáp lại sự cổ vũ nhiệt tình của các bạn xung quanh. Ngỡ rằng, đây chính là những thiên thần bé nhỏ, đang chơi đùa trong khung cảnh ngây thơ, trong sáng của tuổi học trò. Gần đó là trò chơi đá cầu cũng lí thú không kém.
Quả cầu nhiều màu sắc như bảy màu tinh tú của cầu vồng. Nó được đôi chân khoẻ khoắn, nhanh nhẹn của các bạn nam làm cho có sức sống. Chẳng có thể nhìn thấy quả cầu xinh xinh đâu nữa, mà chỉ thấy đôi chân nhanh nhẹn thoắt lên, thoắt xuống của các bạn. mấy bạn đứng xem, người thì chăm chú nhìn quả cầu tung lên hạ xuống, người thì trổ tài dự đoán xem bàn chân nào khéo nhất. Cuối cùng, bạn nam lớp tôi cũng giành chiến thắng bởi những cú đá hiểm hóc.
Thật sung sướng! Khi nhận được danh hiệu mà các bạn yêu thích tăng cho đó là: “quả cầu thần”. Có bạn muốn tìm cho mình một sự thư giãn nhẹ nhàng, lại đến bên gốc bàng xanh mướt kia ngồi đọc những cuốn sách lí thú. Vẻ chăm chú ấy làm cho ai cũng tin rằng đó là những cô gái, chàng trai sẽ là những tinh hoa cho xã hội, làm nên một cuộc sống tươi đẹp cho chính mình và cả đất nước. Với những “nhà thơ nhí” luôn thả mình vào trong bầu không khí sôi động, hồn nhiên, để có thể nảy ra những vần thơ chứa chan thi vị. Ngược lại, các bạn trai hiếu động lại tìm thấy niềm vui riêng trong trò chơi đuổi bắt. Mồ hôi nhễ nhại toát ra như tắm, nhưng dường như nó chẳng là gì đối với các bạn, bởi lẽ ai cũng thấy lòng rộn lên niềm vui của trẻ thơ. Vì là một vận động viên điền kinh, nên bảo luôn là một “đối thủ” đáng gờm.
Chẳng vậy, mà bạn nào bạn nấy cũng cố gắng thoát khỏi vòng vây của Bảo “vận động viên điền kinh tương lai”. Chị gió tốt bụng dùng chiếc quạt của mình xua tan cái nắng nóng cho cả sân trường. Những bạn gái nhút nhát, dịu dàng lại luôn quây quần lại luôn quây quần bên gốc cây phượng vĩ tâm sự về mọi việc mà các bạn cho là lí thú nhất. Sân trường vui thật đấy! Làm cho các chú chim sâu cũng phải ngó xuống nhìn. Những chùm hoa sữa nở rộ toả hương thơm quyến rũ, dù chỉ với bông hoa li ti, trắng muốt. Trên không trung, ông mặt trời cháy bỏng, ngó xuống nhìn nở nụ cười với đàn em thơ đang nô đùa.
Bỗng ba hồi trống vang lên, các bạn học sinh lần lượt vào lớp, ai cũng tươi tắn như những đoá hoa ban mai. Bởi các bạn sắp bước vào những tiết học sôi nổi hào hứng. Giờ ra chơi ở trường em là vậy đó, nó mang lại cho chúng em biết bao kỉ niệm thân thương, dưới mái trường mến yêu.
Tùng, tùng, tùng..., một hồi trống ngắn vang lên báo hiệu đã đến giờ ra chơi sau tiết hai. Từ các cửa lớp, học sinh ùa ra như ong vỡ tổ. Sân trường đang vắng vẻ, lặng lẽ, phút chốc đã rộn rã tiếng nói tiếng cười của mấy trăm học sinh đang tung tăng chạy nhảy.
Một hồi trống dài thôi thúc, báo hiệu tiết mục thể dục giữa giờ bắt đầu. Chúng em nhanh nhẹn xếp thành hàng đúng theo vị trí quen thuộc, mỗi người cách nhau một sải tay. Theo tiếng trống, từng động tác được thực hiện nhịp nhàng đều đặn. Những cánh tay mềm mại quay trái, quay phải. Bao gương mặt hồn nhiên tươi rói dưới ánh nắng mai.
"Khoẻ, khoẻ! ". Tiếng hô đồng thanh vang động cả sân trường làm cho mấy chú chim sâu, chim sẻ sợ hãi bay vút lên cao.
Tiếp sau đó là giờ chơi của chúng em. Mỗi nhóm tìm đến một góc sân để chơi những trò quen thuộc như: nhảy dây, đuổi bắt, kéo co... Dưới gốc cây bàng già, bốn bạn nữ Thu, Ngọc, Lan, Hương đang chụm đầu vào nhau, không biết kể chuyện gì mà cùng cười rúc rích. Cách đó không xa, tốp nam lớp em đá cầu. Trái cầu làm bằng những vòng cao su tròn nhiều màu, ở giữa cắm mấy chiếc lông ngỗng trắng, vun vút bay đi bay lại. Tiếng bàn tán nổi lên, xen lẫn tiếng cười nói thật là vui nhộn, ổn ào nhất là đám kéo co. Mỗi bên có tới hàng chục người, người này ôm ngang lưng người khác. Đứng đầu hai bên là Nam và Đức, hai bạn đều to khoẻ ngang nhau. Sau tiếng hô dõng dạc của trọng tài Hoàng, hai bên cong lưng, xoãi chân, bậm môi, ra sức kéo. Một hồi lâu vẫn chưa phân thắng bại. Bất chợt, Nam buông tay làm cho các bạn té ngửa, nằm chồng lên nhau ngổn ngang dưới đất. Những tràng vỗ tay, reo hò vang động.
Giờ chơi trôi qua nhanh chóng. Tiếng trống báo giờ vào học đã điểm. Chúng em nhanh chống trở về lớp, gương mặt ai nấy đều toát lên vẻ vui tươi, rạng rỡ thật đáng yêu. Thời gian ra chơi tuy ngắn nhưng đã đem lại cho chúng em sự thoải mái về mặt thể chất và tinh thần để chúng em tiếp tục học tập được tốt hơn.
Tôi là Nguyễn Hữu Đa, năm nay tôi đã 70 tuổi rồi mà tôi vẫn chưa thấy câu hỏi nào như thế này. Cho tôi hỏi 1+1=?. Tôi sẽ không nói là tôi sẽ tick cho những ai trả lời sai :). Chúc làm bài thật tốt.
dạ chào oog cháu xin trả lời 1+1=....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................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1 + 1 = 2
Nội qui tham gia "Giúp tôi giải toán"
1. Không đưa câu hỏi linh tinh lên diễn đàn, chỉ đưa các bài mà mình không giải được hoặc các câu hỏi hay lên diễn đàn;
2. Không trả lời linh tinh, không phù hợp với nội dung câu hỏi trên diễn đàn.
3. Không "Đúng" vào các câu trả lời linh tinh nhằm gian lận điểm hỏi đáp.
Các bạn vi phạm 3 điều trên sẽ bị giáo viên của Online Math trừ hết điểm hỏi đáp, có thể bị khóa tài khoản hoặc bị cấm vĩnh viễn không đăng nhập vào trang web.
tôi là Trần Dần, nhà tiên tri vũ trụ, tôi có câu trả lời như sau :1+1=2 ok không cần cảm ơn chỉ cần k thôi
2./1x6 + 2/6x11 +2/11x16 + 2/16x21 + 2/21x26
\(\frac{2}{1x6}+\frac{2}{6x11}+\frac{2}{11x16}+\frac{2}{16x21}+\frac{2}{21x26}\)
= \(\frac{2}{6}+\frac{2}{66}+\frac{2}{176}+\frac{2}{336}+\frac{2}{546}\)
= \(\frac{1}{3}+\frac{1}{33}+\frac{1}{88}+\frac{1}{168}+\frac{1}{273}\)
=\(\frac{5}{13}\)
Mình tự nghĩ đấy .
Chúc bạn học tốt!
Em suy nghĩ và rút ra đc bài học j cho bản thân qua câu danh ngôn: hỏi 1 câu chỉ dốt nát trong chốt lát. Không dám hỏi sẽ dốt nát cả đời.
Giúp mik vs nha các pạn
Em rút ra được là:
Thà mình hỏi mình ngu trong 1 chút nhưng sau đó mình hiểu, còn hơn là mình giấu ngu thì mình sẽ không biết và sẽ dốt cả đời
Bài học: Những người không biết mà hỏi người khác thì chỉ bị chê cười một lúc còn những kẻ bị người khác chê cười mà không dám hỏi thì mãi mãi sẽ không biết được gì cả.