5.6×12.5和0.58×9＋0.58这两题怎么简便计算啊!

5.6×12.5=0.7×（8×12.5）=0.7×100=70
0.58×9+0.58=0.58×（9+1）=0.58×10=5.8（乘法分配率）

5.6x12.5=(5+0.6)x(12+0.5)=5x12+5x0.5+0.6x12+0.6x0.5=60+2.5+7.2+0.3=70
0.58x9+0.58=0.58x(9+1)=5.8

0.58×9＋0.58
=0.58×9+0.58×1
=0.58×（9+1）
=0.58×10
=5.8

5.6×12.5
=0.7x8x12.5
=0.7x100
=70
0.58×9＋0.58
=0.58(9+1)
=0.58x10
=5.8

5.6x12.5
=0.7x8x12.5
=0.7x100
=70
0.58x9+0.58
=0.58x(9+1)
=0.58x10
=5.8