3/5+0.25x=17/200.25x=17/20-3/50.25x=(17-12)/200.25x=1/4x=1/4÷0.25x=1
解:1/4x=17/20-3/51/4x=17/20-12/201/4x=1/4x=1
解:0.25x=17/20-3/50.25x=17/20-12/20x=5/20÷0.25x=1