Question

99.99×0.78+33点33×0.66的简便运算

Answer 1

可以利用乘法分配律。
99.99×0.78+33.33×0.66
=99.99×0.78+99.99×0.22
=99.99×(0.78+0.22)
=99.99×1
=99.99

Answer 2

99.99×0.78+33点33×0.66的简便运算
原式=33.33×3×0.78+33.33×0.66
=33.33×（0.78×3+0.66）
=33.33×（2.34+0.66）
=33.33×3
=99.99