88.8*8.7+11.2*9.9-11.2*1.2怎么做?

问题描述:

88.8*8.7+11.2*9.9-11.2*1.2怎么做?

88.8*8.7+11.2*9.9-11.2*1.2
=88.8*8.7+11.2*(9.9-1.2)
=88.8*8.7+11.2*8.7
=(88.8+11.2)*8.7
=100*8.7
=870