100.2×99.8用平方差计算等于多少要步骤

问题描述:

100.2×99.8用平方差计算等于多少要步骤

100.2*99.8
=(100+0.2)*(100-0.2)
=100*100-0.2*0.2
=10000-0.04
=9999.96