1.345*2.69-1.345^2-0.345^2计算过程是?
问题描述：
1.345*2.69-1.345^2-0.345^2计算过程是?
答
=1.345*（2.69-1.345)-0.345^2
=1.345^2-0.345^2
=(1.345+0.345)*(1.345-0.345)
=1.69*1
=1.69