15.37*7.88-9..37*7.88+15.37*2.12-9.37*2.12简便计算
问题描述：
15.37*7.88-9..37*7.88+15.37*2.12-9.37*2.12简便计算
答
15.37*7.88-9..37*7.88+15.37*2.12-9.37*2.12
=7.88*（15.37-9.37）+2.12*（15.37-9.37）
=7.88*6+2.12*6
=6*（7.88+2.12）
=6*10
=60