0.24×1.9+2.4×0.81 的简便计算.

问题描述:

0.24×1.9+2.4×0.81 的简便计算.

0.24×1.9+2.4×0.81
=2.4*0.19+2.4*0.81
=2.4*(0.19+0.81)
=2.4*1
=2.4