1.3x÷2=0.391.3x=0.39*21.3x/1.3=0.39*2/1.3x=0.3*2x=0.6
1.3x÷2=0.39解:1.3x=0.39x2x=0.78÷1.3x=0.6
1.3x=0.39x2 1.3x=0.78 x=0.6