CÂU TRL LÀ  NHA E , CHÚC EM HỌC GIỎI

8 em nhé

8 nha em xin k em ới
 

\(OK\)

\(\frac{1}{9}:\frac{1}{3}=\frac{1}{3}\)

\(\text{Có thật đây là toán lớp 7 không thế?}\)

để pt 1+1=2 ta lấy 1+1

Cái này thì em cần nắm vững quy tắc thực hiện phép tính của biểu thức là làm được

Trong biểu thức nếu có chứa dấu ngoặc thì ta làm trong ngoặc trước ngoài ngặc sau

Chiếu theo quy tắc trên em làm các phép tính trong ngoặc trước, sau đó em tiến hành rút gọn các hạng tử giống nhau, em sẽ thu được kết quả cần tính

                        Giải:

A = ( 1 - \(\dfrac{1}{2}\))x(\(1-\dfrac{1}{3}\))x...x(1 - \(\dfrac{1}{100}\))

A = \(\dfrac{2-1}{2}\)x\(\dfrac{3-1}{3}\)x...x\(\dfrac{100-1}{100}\)

A = \(\dfrac{1}{2}\)x\(\dfrac{2}{3}\)x...x\(\dfrac{99}{100}\)

A = \(\dfrac{2\times3\times...\times99}{2\times3\times..\times99}\)x \(\dfrac{1}{100}\)

A = \(\dfrac{1}{100}\)

The one i love most is my mother. She is tall and rather thin
She is a warm kindly person with an oval face and a long-silky hair.
My mother loves us very much. She is used to staying up late and getting up early to earn money and take care of us. She is strict thanks to that we are educated into a good person.I will try to study well to satisfy my mother's faith.

k cho mk nghen

Trong gia đình, vì em là con út nên ai cũng thương yêu em hết mực, nhưng mẹ là người gần gủi, chăm sóc em nhiều nhất.

Năm nay, mẹ em gần bốn mươi mốt tuổi. Với thân hình mảnh mai, thon thả đã tô đậm cho mẹ với vẻ đẹp của người mẹ hiền từ, mái tóc đen óng mượt mà dài ngang lưng được mẹ thắt lên gọn gàng khi ra đường. Đôi mắt mẹ đen láy luôn nhìn em với ánh mắt trìu mến gần gũi. Khuôn mặt mẹ hình trái xoan với làn da trắng.

Đôi môi mỏng đỏ hồng nằm dưới chiếc mũi cao thanh tú làm cho càng nhìn càng thấy đẹp. Khi cười nhìn mẹ tươi như hoa, đóa hoa hồng vừa nở sớm mai. Đôi bàn tay mẹ tròn trịa, trắng trẻo đã nuôi nấng, dìu dắt em từ thưở em vừa lọt lòng. Giọng nói của mẹ đầy truyền cảm, lúc mượt mà như tiếng ru, lúc ngân nga như tiếng chim họa mi buổi sớm. Mẹ em may và thêu rất đẹp, đặc biệt là may áo dài, thường ngày mẹ hay mặc bộ đồ bộ gọn gàng, khi đi dạy học mẹ mặc những bộ áo dài cũng do mẹ tự may trông thật duyên dáng, sang trọng.

Ở nhà, mẹ là người đảm nhiệm công việc nội trợ. Mẹ giao cho em các công việc nhẹ nhàng như: quét nhà, gấp quần áo… Còn ba thì phụ mẹ giặt đồ, dọn dẹp nhà cửa sạch sẽ, thỉnh thoảng mẹ mua hoa về chưng ở phòng khách cho đẹp nhà. Mỗi khi khách đến mẹ luôn đón tiếp nồng hậu, mời khách đĩa trái cây và nước mát. Sáng mẹ là người thức dậy sớm để chuẩn bị thức ăn sáng cho cả nhà, để hai anh em cùng cắp sách đến trường kịp giờ học.

Khi em ốm đau mẹ phải thức suốt đêm để chăm sóc. Buổi tối, mẹ thường dành khoảng ba mươi phút để giảng bài cho em, sau đó mẹ ngồi chấm bài, soạn giáo án chuẩn bị cho tiết lên lớp ngày mai ở trường… Mẹ rất nhân hậu, hiền từ, khi lên lớp mẹ xem học trò như các con của mình, cũng dìu dắt thương yêu hết mực nên mẹ được rất nhiều học sinh yêu mến. Khi em phạm lỗi, mẹ chỉ nhắc nhỡ chứ không mắng và cũng chưa đánh em bao giờ.

Mẹ em thật đáng quí, em luôn yêu thương mẹ và tự hào vì được làm con của mẹ. Mỗi khi được mẹ ôm ấp, nằm trong lòng mẹ em cảm thấy thật ấm áp. Trong trái tim em, mẹ là tất cả, mẹ là cô tiên tuỵêt vời nhất trong cuộc đời em… Em mong sao cho mình mau lớn để có thể giúp cho mẹ đỡ vất vả hơn. Em hứa sẽ chăm học và cố gắng học thật giỏi để trả ơn cho mẹ và thầy cô đã dạy dỗ, nuôi nấng em nên người. Mẹ ơi, con yêu mẹ lắm!

thanks

Ta có \(2x^2-2xy=5x-y-19\Leftrightarrow2x^2-5x+19=2xy-y\)

<=>\(\frac{2x^2-5x+19}{2x-1}=y\)

Mà y là số nguyên =>\(\frac{2x^2-5x+19}{2x-1}\in Z\Leftrightarrow\frac{2x^2-x-4x+2+17}{2x-1}\in Z\)

\(\Leftrightarrow2x-2+\frac{17}{2x-1}\in Z\Leftrightarrow\frac{17}{2x-1}\in Z\Rightarrow17⋮2x-1\)

đến đây lấp bảng nhé !

^_^

Thanks ban nha

\(t\text{a}\)\(co\) \(2x^2-2xy=5x-y-19\Rightarrow2x^2-5x-19=2xy-y\)  

\(\Leftrightarrow\frac{2x^2-5x+19}{2x-1}=y\)  

Ma y la số nguyên\(\Rightarrow\frac{2x^2-5x-19}{2x-1}\in Z\Leftrightarrow\frac{2x^2-x-4x+2+17}{2x-1}\in Z\)   

\(2x-2+\frac{17}{2x-1}\in Z\Leftrightarrow\frac{17}{2X-1}\in Z\Leftrightarrow17⋮2X-1\)  

BN TU LaP BaNG NHE

chỉ phân tích thôi không cần tìm x;y à

Hừm đề bài yêu cầu tính cái gì

chiều rộng của vườn hoa là:

   170 : (2+3) . 2 = 68 (m)

chiều dài của vườn hoa là:

   170 - 68 =  102 (m)

Chiều rộng vườn hoa là :

   \(\dfrac{170}{\left(2+3\right)}\times2=68\left(m\right)\)

Chiều dài vườn hoa là :

   \(68:\dfrac{2}{3}=102\left(m\right)\)

Tự làm nốt vì ko bít đề bài yê cầu tính cái gì .-.

The Kinh are also known as the Vietnamese, and Son La is the second largest group, accounting for 18% of the province's population. Population is concentrated in urban areas. Kinh language in Vietnamese - Muong language. Apart from the part of ethnic minorities residing in Son La area, many people have just moved from the North and North Central Plains. Especially since listening to the call of the Party to build mountainous economic development, Kinh people from the delta provinces to Son La; The family of Dien Bien Phu campaign soldiers stayed in the mountainous region. At present, some areas in the province of Kinh ethnic minorities include Kinh people in Hai Duong, Hung Yen and Thai Binh provinces in Song Ma and Yen Chau districts; Thai Binh province in Thuan Chau, Ha Tay province in Mai Son and so on.Kinh people living in Son La are interspersed with ethnic minority people. They quickly integrate in production, cultural exchange and solidarity to create cohesion and development in Son land. Leaves. The Kinh are also called Vietnamese. The Kinh language belongs to the Viet-Muong language group. Kinh people do farming. In the wet rice cultivation, the Kinh people have traditionally built dikes, ditches. Horulture, mulberry growing, livestock and poultry husbandry, river fishing and marine fish development. Pottery is very early. Kinh people have habits betel betel, drinking tea, water. In addition to fried rice, sky rice, also porridge, sky rice. Shrimp sauce, duck eggs flipped is a unique dish of the Kinh.The Kinh village is often surrounded by bamboo, and there is a strong village gate in many places. Each village has a communal meeting place and worship. Kinh people live in the land. In the Kinh family, the husband (the father) is the owner. Children take their father and father's relatives as "family", while mother is "grandfather". The first son was responsible for organizing the worship of his parents, grandparents. Each of them has their own church, with their heads in charge of their work. Monogamy marriage The wedding is going through many rituals, the boy asked his wife and married his wife. After the wedding, the bride returns home. The men respect virginity, virtue of the bride, and pay attention to their background.The ancestor worshipers of the Kinh. The deceased are sacrificed by their descendants every year on the day they die. Their graves are regularly visited by relatives and carers. Every year the farmer has a series of festivals and festivals associated with farmer beliefs. In addition, Buddhism, Taoism, Taoism, Catholicism from the outside came into being received at different levels. The literary capital of the Kinh is quite large: oral literature (stories, folk songs, proverbs), literary literature (poetry, literature, books). Early and advanced art in many respects: singing, music, sculpture, painting, dancing, singing. The annual village festival is one of the most exciting and lively events in the countryside.

The Kinh are also known as the Vietnamese, and Son La is the second largest group, accounting for 18% of the province's population. Population is concentrated in urban areas. Kinh language in Vietnamese - Muong language. Apart from the part of ethnic minorities residing in Son La area, many people have just moved from the North and North Central Plains. Especially since listening to the call of the Party to build mountainous economic development, Kinh people from the delta provinces to Son La; The family of Dien Bien Phu campaign soldiers stayed in the mountainous region. At present, some areas in the province of Kinh ethnic minorities include Kinh people in Hai Duong, Hung Yen and Thai Binh provinces in Song Ma and Yen Chau districts; Thai Binh province in Thuan Chau, Ha Tay province in Mai Son and so on.Kinh people living in Son La are interspersed with ethnic minority people. They quickly integrate in production, cultural exchange and solidarity to create cohesion and development in Son land. Leaves. The Kinh are also called Vietnamese. The Kinh language belongs to the Viet-Muong language group. Kinh people do farming. In the wet rice cultivation, the Kinh people have traditionally built dikes, ditches. Horulture, mulberry growing, livestock and poultry husbandry, river fishing and marine fish development. Pottery is very early. Kinh people have habits betel betel, drinking tea, water. In addition to fried rice, sky rice, also porridge, sky rice. Shrimp sauce, duck eggs flipped is a unique dish of the Kinh.The Kinh village is often surrounded by bamboo, and there is a strong village gate in many places. Each village has a communal meeting place and worship. Kinh people live in the land. In the Kinh family, the husband (the father) is the owner. Children take their father and father's relatives as "family", while mother is "grandfather". The first son was responsible for organizing the worship of his parents, grandparents. Each of them has their own church, with their heads in charge of their work. Monogamy marriage The wedding is going through many rituals, the boy asked his wife and married his wife. After the wedding, the bride returns home. The men respect virginity, virtue of the bride, and pay attention to their background.The ancestor worshipers of the Kinh. The deceased are sacrificed by their descendants every year on the day they die. Their graves are regularly visited by relatives and carers. Every year the farmer has a series of festivals and festivals associated with farmer beliefs. In addition, Buddhism, Taoism, Taoism, Catholicism from the outside came into being received at different levels. The literary capital of the Kinh is quite large: oral literature (stories, folk songs, proverbs), literary literature (poetry, literature, books). Early and advanced art in many respects: singing, music, sculpture, painting, dancing, singing. The annual village festival is one of the most exciting and lively events in the countryside.

The Kinh are also known as the Vietnamese, and Son La is the second largest group, accounting for 18% of the province's population. Population is concentrated in urban areas. Kinh language in Vietnamese - Muong language. Apart from the part of ethnic minorities residing in Son La area, many people have just moved from the North and North Central Plains. Especially since listening to the call of the Party to build mountainous economic development, Kinh people from the delta provinces to Son La; The family of Dien Bien Phu campaign soldiers stayed in the mountainous region. At present, some areas in the province of Kinh ethnic minorities include Kinh people in Hai Duong, Hung Yen and Thai Binh provinces in Song Ma and Yen Chau districts; Thai Binh province in Thuan Chau, Ha Tay province in Mai Son and so on.Kinh people living in Son La are interspersed with ethnic minority people. They quickly integrate in production, cultural exchange and solidarity to create cohesion and development in Son land. Leaves. The Kinh are also called Vietnamese. The Kinh language belongs to the Viet-Muong language group. Kinh people do farming. In the wet rice cultivation, the Kinh people have traditionally built dikes, ditches. Horulture, mulberry growing, livestock and poultry husbandry, river fishing and marine fish development. Pottery is very early. Kinh people have habits betel betel, drinking tea, water. In addition to fried rice, sky rice, also porridge, sky rice. Shrimp sauce, duck eggs flipped is a unique dish of the Kinh.The Kinh village is often surrounded by bamboo, and there is a strong village gate in many places. Each village has a communal meeting place and worship. Kinh people live in the land. In the Kinh family, the husband (the father) is the owner. Children take their father and father's relatives as "family", while mother is "grandfather". The first son was responsible for organizing the worship of his parents, grandparents. Each of them has their own church, with their heads in charge of their work. Monogamy marriage The wedding is going through many rituals, the boy asked his wife and married his wife. After the wedding, the bride returns home. The men respect virginity, virtue of the bride, and pay attention to their background.The ancestor worshipers of the Kinh. The deceased are sacrificed by their descendants every year on the day they die. Their graves are regularly visited by relatives and carers. Every year the farmer has a series of festivals and festivals associated with farmer beliefs. In addition, Buddhism, Taoism, Taoism, Catholicism from the outside came into being received at different levels. The literary capital of the Kinh is quite large: oral literature (stories, folk songs, proverbs), literary literature (poetry, literature, books). Early and advanced art in many respects: singing, music, sculpture, painting, dancing, singing. The annual village festival is one of the most exciting and lively events in the countryside.