9.99*7.78+3.33*6.66的简便方法怎样算
问题描述:
9.99*7.78+3.33*6.66的简便方法怎样算
答
9.99*7.78+3.33*6.66
=9.99*7.78+2.22*9.99
=9.99*(7.78+2.22)
=9.99*10
=99.9