来自韩慧的问题
简便计算题五年级8.9*9.90.02*38.7*501.25*(8+0.8)
简便计算题五年级8.9*9.90.02*38.7*501.25*(8+0.8)
1回答
2020-04-09 09:29
简便计算题五年级8.9*9.90.02*38.7*501.25*(8+0.8)
简便计算题五年级8.9*9.90.02*38.7*501.25*(8+0.8)
8.9*9.9
=8.9*(10-0.1)
=89-0.89
=88.11
0.02*38.7*50
=38.7*0.02*50
=38.7*1
=38.7
1.25*(8+0.8)
=1.25*8+1.25*0.8
=10+1
=11