兩邊同乘以0.3
0.3-30x-18(5-2x)=0.3
0.3-30x-90+36x=0.3
36x-30x=90-0.3+0.3
6x=90
x=90÷6
x=15
(0.3-30x)\0.3-3(5-2x)\0.05=1
(0.3-30x)\0.3-3(5-2x)\0.05=1
數(shù)學人氣：744 ℃時間：2020-05-06 11:39:40
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