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11 tháng 10 2019 lúc 21:49
Tính:E=10.11+11.12+...+98.99+99.100
Tính tổng: A= 7/10.11+7/11.12+7/12.13+...+7/69.70
1.2+2.3+3.4+...+97.98+98.99
tính tổng nha
Tính \(A=\frac{1.98+2.97+3.96+...+97.2+98.1}{1.2+2.3+3.4+...+97.98+98.99}\)
Tính nhanh
1. 2100+299+298+297+.......+22+2
2. A=4/5.7 + 4/7.9 +......+4/59.61
3. C= 1/10.11+1/11.12 +......+ 1/99.100
4. D=5/11.16 + 5/16.21 + ......+5/61.66
5. 2100-299+298-297
Chứng minh rằng: B = \(\frac{1.98+2.97+3.96+...+96.3+97.2+98.1}{1.2+2.3+3.4+...+96.97+97.98+98.99}=\frac{1}{2}\)
\(\frac{1}{10.11}\)+\(\frac{1}{11.12}\)+.....+\(\frac{1}{2015.2016}\)
Chứng minh rằng \(\frac{1.98+2.97+3.96+...+96.3+97.2+98.1}{1.2+2.3+3.4+...+96.97+97.98+98.99}=\frac{1}{2}\)
Cho M=1/1.2+1/3.4+...+1/97.98+1/99.100
Chứng minh 7/12<M<5/6