方法一、x÷4-0.9=0.25x÷4=0.9+0.25x÷4=1.15x=1.15×4x=4.6方法二、x-3.6=0.25×4x-3.6=1x=3.6+1x=4.6
两边同乘以4得x-4=0.25×4x-4=1x=1+4=5
解x-3.6=0.25×4x-3.6=1x=3.6+1x=4.6