77.7*99+111*0.7怎样简便计算_数学解答

77.7*99+111*0.7怎样简便计算

人气：351 ℃　时间：2019-12-01 10:30:14

解答

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