要使算式3×(□-0.25)÷0.75+0.8=5,那么□中应填的数是?

问题描述:

要使算式3×(□-0.25)÷0.75+0.8=5,那么□中应填的数是?

(5-0.8)*0.75/3+0.25
=4.2*0.75/3+0.25
=3.15/3+0.25
=1.05+0.25
=1.3