(455-12.5×4) ÷ 8.1 简便计算
问题描述：
(455-12.5×4) ÷ 8.1 简便计算
答
(455-12.5×4) ÷ 8.1
=(455-50) ÷ 8.1
=405 ÷ 8.1
=810 ÷ 8.1 ÷2
=100 ÷2
=50
答
=(455-50)*2/8.1*2
=405*2/8.1*2
=810/8.1*2
=50