4/7*5+2/7*6+1/7*24的简便计算

问题描述:

4/7*5+2/7*6+1/7*24的简便计算

1/7 × (4×5+2×6+1×24)
1/7×56
8

4/7*5+2/7*6+1/7*24
即4/7*5+4/7*3+4/7*6
4/7*(5+3+6)=56/7

1/7(4*5+2*6+24)=1/7*56=8

=1/7*(4*5+2*6+24)=56/7=8

4/7*5+2/7*6+1/7*24
=1/7×(4×5+2×6+2×4)
=1/7×56
=8