77.7*99+111*0.7怎样简便计算
问题描述:
77.7*99+111*0.7怎样简便计算
答
77.7*99+111*0.7
=777*0.1*99+111*7*0.1
=777*9.9+777*0.1
=77*(9.9+0.1)
=777*10
=7770