1.3x = 1404, x = 1080
解:20*1.5%x+x=14040.3x+x=14041.3x=1404x=1404/1.3x1080
x=1404÷1.3
x=1080
20*0.015x+x=14040.3x+x=14041.3x=1404x=1080