Question

7.2✖️0.3+3✖️0.28简便运算怎么做？

Answer 1

7.2×0.3+3×0.28
＝7.2×0.3+0.3×2.8
＝（7.2+2.8）×0.3
=10×0.3
=3
这是乘法分配律的逆运算
这样计算比较简便。

Answer 2

=7.2×0.3+0.3×10×0.28
=0.3×(7.2+2.8)
=0.3×10
=3

Answer 3

7.2*0.3+3*0.28
=0.72*3+3*0.28
=3*（0.72+0.28）
=3*1
=3