Question

99×5.61+5.61用简便计算？

Answer 1

99×5.61+5.61
=5.61x(99+1)
=5.61x100
=561

Answer 2

=5.61*（99+1）=5.61*100=561
应该是叫乘法的结合律。

Answer 3

99*5.61+1*5.61=（99+1）*5.61=100*5.61=561 这应该是最简便了吧

Answer 4

把99先当做100，100乘以5.61等于561，然后再减去一个5.61与后面的加5.61消除了，所以最后答案就是561

Answer 5

99×5.61+5.61
=5.61x(99+1)
=5.61x100
=561