百分之四十x等于十二分之七加十二分之三 五分之二x等于十二分之十x等于十二分之二十五
40%x-1/4=7/120.4x=1/4+7/120.4x=5/6x=25/12
40x%-1/4=7/120.4x=7/12+1/40.4x=7/12+3/120.4x=5/6x=5/6÷0.4x=5/2.4x=2又1/12
十二分之25
40%x-1/4=7/122x/5-1/4=7/1224x/60-15/60=35/6024x-15=3524x=50x=25/12