4x+(100-x)/4=100解:4x+(100-x)/4=10016x+100-x-400=015x=300x=20
去分母(两面x4)16x+100-x=400移项变号(100 -100)15x=300x=20
4x+(100-x)/4=10016x+100-x-400=015x=300x=20
15/4*x=75x=20