23*0.1+2.3*9.9的简便计算
问题描述:
23*0.1+2.3*9.9的简便计算
答
23*0.1+2.3*9.9
=2.3+2.3*(10-0.1)
=2.3+23-0.23
=25.3-0.23
=25.07