Question

9.99x7.78+3.33x6.66的巧算方法

Answer 1

9.99*7.78+3.33*6.66=9.99*7.78+9.99*2.22=9.99*（7.78+2.22）=9.99*10=99.9

Answer 2

9.99X7.78+3.33X6.66
=9.99X7.78+9.99X2.22
=9.99×（7.78+2.22）
=9.99×10
=99.9

Answer 3

你好笨！