Tính
a) A = \(\frac{2}{1.7}\)+\(\frac{2}{7.13}+\frac{2}{13.19}+...+\frac{2}{601.607}\)
giúp mik vs
tìm x
\(X:\left(\frac{5}{1.7}+\frac{5}{7.13}+\frac{5}{13.19}+...+\frac{5}{601.607}\right)=0\)
tính G= \(\frac{6^2}{1.7}+\frac{6^2}{7.13}+\frac{6^2}{13.19}+...+\frac{6^2}{n\left(n+6\right)}\)
a, A=1.7+7.13+13.19+19.25+.....+9.97
b, B= 2^2+3^2+4^2+...........+80^2
c, C=1.99+2.98+3.97+.......+99.1
giúp mình đc ko
mình đang cần gấp
1/1.7+1/7.13+1/13.19+......+1/61.67
1/1.2.3+1/2.3.4+1/3.4.5+.......+1/8.9.10
1/1+2 + 1/1+2+3 + 1/1+2+3+4 +.......+ 1/1+2+3+....+99
CẦN GẤP
Tính bằng cách hợp lí :
\(A=1.7+7.13+13.19+....+91.97\)
5/1.7+5/7.13+5/13.19+...+5/2017.2023
36/1.7 + 36/7.13+36/13.19+...+36/94.100
Tính : S = 4/1.7 + 4/7.13 + 4/ 13.19 + 4/43.49