1/6[20x+50]+2/3[5+2x]-1/2[4x+10]=0
兩邊同時乘以6
20x+50+4（5+2x）-3(4x+10)=0
20x+50+20+8x-12x-30=0
16x=-40
x=-2.5
1/6[20x+50]+2/3[5+2x]-1/2[4x+10]=0
1/6[20x+50]+2/3[5+2x]-1/2[4x+10]=0
數(shù)學人氣：833 ℃時間：2020-05-10 04:53:15
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