Question

5.43 +4.57x0.8的简便计算？

Answer 1

解题：运用乘法分配律，可简便计算如下，
5.43+4.57x0.8
=5.43+4.57x(1-0.2)
=5.43+4. 57x1-4.57x0.2
=5.43+4.57-0.914
=10-0.914
=9.086

Answer 2

5.43+4.57×（1-0.2）
=5.43+4.57-4.57×0.2
=10-（5-0.43）×0.2
=10-（1-0.086)
=10-1+0.086
=9.086