\(\)CMR \(\frac{1}{2^2}+\frac{1}{3^2}+...+\frac{1}{100^2}< 1\)
https://olm.vn/hoi-dap/detail/221548686818.html ai xem rồi bình luận nhé please
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1+1 = ??? KO tloi please hãy xem link bên dưới xem mn có thấy tức ko
https://olm.vn/hoi-dap/detail/221548686818.html
\(\text{x + 1 = 2 + }\frac{1}{2}+\frac{4}{3}\)
Vào trang này để thi có thưởng https://olm.vn/hoi-dap/detail/203748821457.html
Tìm x biết \(x+\frac{2}{3}=\frac{5}{6}\)
Mn ơi https://olm.vn/hoi-dap/detail/214365223643.html
Lại thêm 1 bài nữa cho các bạn đây:
Tính giá trị của biểu thức:
\(\frac{1}{1+2}\)+ \(\frac{1}{1+2+3}\)+ \(\frac{1}{1+2+3+4}\)+ \(\frac{1}{1+2+3+4+\text{5}}\)+ ... + \(\frac{1}{1+2+...+10}\)
\(\frac{1}{1+2}+\frac{1}{1+2+3}+....+\frac{1}{1+2+3+...+10}=\frac{1}{\frac{2.3}{2}}+\frac{1}{\frac{3.4}{2}}+...+\frac{1}{\frac{10.11}{2}}\)(dựa vào công thức:
\(1+2+...+n=\frac{n\left(n+1\right)}{2}\)(với n là số nguyên dương). Nên biểu thức sẽ bằng:
\(\frac{2}{2.3}+\frac{2}{3.4}+...+\frac{2}{10.11}=2\left(\frac{1}{2.3}+...+\frac{1}{10.11}\right)=2\left(\frac{3-2}{2.3}+....+\frac{11-10}{10.11}\right)\)
\(=2\left(\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-....-\frac{1}{11}\right)=2\left(\frac{1}{2}-\frac{1}{11}\right)=1-\frac{2}{11}=\frac{9}{11}\).
Vậy đáp án là: \(\frac{9}{11}\).
1+1=?
2+2=?
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https://olm.vn/hoi-dap/detail/216220755599.html
Help nhé mn
1+1= nà ní
Giứp mình làm ba bài này với:
https://olm.vn/hoi-dap/detail/229706712415.html
https://olm.vn/hoi-dap/detail/229707455490.html
https://olm.vn/hoi-dap/detail/229707779576.html
Ai làm nhanh nhất mình tặng 3 tick !!!
Bài2:điền một từ thích hợp vào chỗ trống1.The Temple of Literature was in 10702, Thong Nhat is a landmark in Ho Chi Minh City.3, Ha Long Bay was recognised by UNESCO as a World site4, Khue Van Pavilion was chosen as the of Hanoi5. The One Pillar was built in 1049.7, Chu Van an was in 1292 in Van Thon village8, Tran quoc pagoda is at the southeastern shore of West Lake.
Đọc tiếp
Bài2:điền một từ thích hợp vào chỗ trống
1.The Temple of Literature was in 1070
2, Thong Nhat is a landmark in Ho Chi Minh City.
3, Ha Long Bay was recognised by UNESCO as a World site
4, Khue Van Pavilion was chosen as the of Hanoi
5. The One Pillar was built in 1049.
7, Chu Van an was in 1292 in Van Thon village
8, Tran quoc pagoda is at the southeastern shore of West Lake.
Bài 4: Chọn đáp án đúng.1. Thousands of Vietnamese scholars graduated ________ the Imperial Academy. a. from b. in c. at d. of 2. The broth for pho ga is made ________ stewing chicken bones.a. of b. with c. by d. from 3. I haven’t got ________ rice left. Would you like ________ bread instead? a. any – any b. some – some c. no – some d. any – some 4. My sister hates country music, and she hates rap ________. a. either b. also c. neither d. too 5. How much ________ should I use to make the cake? ...
Đọc tiếp
Bài 4: Chọn đáp án đúng.
1. Thousands of Vietnamese scholars graduated ________ the Imperial Academy.
a. from b. in c. at d. of
2. The broth for pho ga is made ________ stewing chicken bones.
a. of b. with c. by d. from
3. I haven’t got ________ rice left. Would you like ________ bread instead?
a. any – any b. some – some c. no – some d. any – some
4. My sister hates country music, and she hates rap ________.
a. either b. also c. neither d. too
5. How much ________ should I use to make the cake?
a. pineapple b. flour c. egg d. carton of milk
6. The first Doctor’s Stone Tablets were ________ in 1484.
a. erected b. selected c. regarded d. located
7. Jazz ________ in the US and is now popular throughout the world.
a. originates b. originated c. was originated d. is originated
8. From his childhood, Chu Van An was ________ for his intelligence.
a. interested b. successful c. talented d. famous
9. ________ was the Temple of Literature founded? – Emperor Ly Thanh Tong.
a. When b. Where c. Who c. By whom
10. ________. – There is some milk and lemon juice in the fridge.
a. What is there for breakfast?b. What is there to drink?c. Is there anything to eat?d. What do you drink?
1a 2a 3d 4a 5b 6a 7b 8d 9c 10c