7.2×14.5+17×2.8怎样简便计算?并且说明一下,那些插入来的数全部都说明一下。

2024-12-01 00:55:15
推荐回答(2个)
回答1:

(7.2+2.8)x14.5+(17-14.5)x2.8
=10x14.5+2.5x4x0.7
=145+7
=152

回答2:

=14.5*7.2+(14.5+2.5)*2.8
=14.5*(7.2+2.8)+2.5*2.8
=145+2.5*2+2.5*0.8
=145+5+2
=152