简便计算:4.2*0.19+0.24*8.1
问题描述:
简便计算:4.2*0.19+0.24*8.1
答
这题是否打错了
4.2x0.19+0.42x8.1
=4.2x0.19+4.2x0.81
=4.2x(0.19+0.81)
=4.2x1
=4.2