(3+0.2x)/0.2-(0.2+0.03x)/0.01=0.75
两边乘于100
20(3+0.2x)-(0.2+0.03x)=75
60+4x-0.2-0.03x=75
4x-0.03x=75-60+0.2
3.97x=15.2
x=15.2/3.97
x=1520/397
(3+0.2x)/0.2 - (0.2+0.03x)/0.01=0.75
(30+2x)/2 - (20+3x)=0.75
(30+2x - 40 - 6x)/2=0.75
-4x - 10 =1.5
4x=11.5
x=23/8
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3+0.2x/0.2-0.2+0.03x/0.01=0.75
3+x-0.2+3x=0.75
4x=-2.05;x=-2.05/4=-205/400=-41/80
(3+0.2x)/0.2-(0.2+0.03x)/0.01=0.75
解:15+x-20+3x=0.75
4x=5.75
x=23/16