求简便计算法 (2.5-2.5*0.6)÷0.4

问题描述:

求简便计算法 (2.5-2.5*0.6)÷0.4

(2.5-2.5*0.6)÷0.4
=2.5(1-0.6)÷0.4
=2.5*0.4÷0.4
=2.5*(0.4÷0.4)
=2.5*1
=2.5