Question

[sakura mi]

1tính tổng

A =(1-1/2)+(1-1/6)+(1-1/12)+..+(1-1/70)

B=(1-1/3)+(1-1/15)+(1-1/35)+(1-1/63)

C=1/2+5/6+11/12+....+8998/9900

D=2/3+14/15+34/35+...+1119/1120

E=9/10+39/40+87/88+....+9998/9999

F=10/56+10/140+10/260+...+10/1400

G=1/1.2.3+1/2.3.4+1/3.4.5+1/+4.5.6+...+1/8.9.10

H=2/2007+2/60.63+2/63.66+...+2/117.120

I=1-1/90-1/72-1/56-1/42-1/30-1/20-1/12-1/6-1/2

mình cần gấp mông mọi người giúp nha !