解方程
χ+60%χ=48
χ-25%χ=27
解:x+0.6x=48 1.6x=48 x=30
解:x-0.25x=27 0.75x=27 x=36
χ-35%χ=0.52
解:x-0.35x=0.52 0.65x=0.52 x=0.8