\(\frac{1}{2}+\frac{1}{6}+............+\frac{1}{9900}\)
\(=\frac{1}{1.2}+\frac{1}{2.3}+............+\frac{1}{99.100}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...........+\frac{1}{99}-\frac{1}{100}\)
\(=1-\frac{1}{100}\)
\(=\frac{99}{100}\)
Tính T=1/2+1/6+1/12+1/20+1/30+....+1/9702+1/9900
Tính t =1/2+1/6+1/12+1/20+1/30+...........+1/9702+1/9900
Tinh T = 1/2 +1/6 + 1/12+1/20+1/30...+1/9702+1/9900
Tính T biết : 1/2+1/6+1/12+1/20+1/30+.........+1/9702+1/9900
tính T = 1/2 +1/6+1/12+1/20+1/30+...+1/9702+1/9900
T=
1/2 +1/6 +1/12 +1/20 +1/30 + +1/9702 +1/9900=T .Tim T
1/2+1/6+1/12+1/20+1/30+.......+1/9702+1/9990
A=1/2+1/6+1/12+1/20+1/30......1/9900
tính : A = 1/2 + 1/6 + 1/12 + 1/20 + ... + 1/9900
