1/2+1/6+1/12+1/20+1/30+1/42的简便运算。

Question

1/2+1/6+1/12+1/20+1/30+1/42的简便运算。1/2+1/6+1/12+1/20+1/30+1/42的简便运算。

Answer 1

简便运算。

Answer 2

你好，你提供的这道数学题你可以先列式，然后再进行计算

Answer 3

1/20+1/30=1/12
1/12+1/12=1/6
1/6+1/6=1/3
1/2+1/3=5/6
5/6+1/42=6/7

Answer 4

1/2+1/6+1/12+1/20+1/30+1/42
=1/(1x2)+1/(2x3)+1/(3x4)+1/(4x5)+1/(5x6)+1/(6x7)
=(1 -1/2) +(1/2-1/3)+...+(1/6-1/7)
=1 -1/7
=6/7

Answer 5

=1/1*2+1/2*3+1/3*4+1/4*5+1/5*6+1/6*7
=(1-1/2)+…+(1/6-1/7)
=1-1/7
=6/7