= 1 -1/2 + 1/2 - 1/3 + 1/3 -...-1/60
= 1-1/60=59/60
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Tính
\(A=\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+...+\frac{1}{59.60}\)
Tính\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}\)
\(M=\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}\)
Tính: \(\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+..........+\frac{1}{997.998}+\frac{1}{999.1000}\)
Tính: \(\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+.......+\frac{1}{997.998}+\frac{1}{999.1000}\)
Tính: \(\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+.....+\frac{1}{997.998}+\frac{1}{999.1000}\)
cho A= \(\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+.........+\frac{1}{99.100}\)
Tính: \(D=\frac{1}{1.2}+\frac{1}{3.4}+\frac{1}{5.6}+......+\frac{1}{999.1000}\)
tính giá trị biểu thức
A =\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}\)
B = \(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+...+\frac{1}{n.\left(n+1\right)}\)(n\(\in\)Z, n\(\ne\)0; n\(\ne\)-1)