简便运算 0.5*4/7+50%*2/7+1/2*1/7

问题描述:

简便运算 0.5*4/7+50%*2/7+1/2*1/7

=1/2*4/7+1/2*2/7+1/2*1/7
= 1/2(4/7+2/7+1/7)
=1/2

0.5*4/7+50%*2/7+1/2*1/7 =0.5*(4+2+1)/7=0.5*7/7=0.5

0.5*4/7+50%*2/7+1/2*1/7
=2x1/7+1x1/7+1/2x1/7
=(2+1+1/2)x1/7
=7/2x1/7
=1/2