3/4[(x+30)-10]=x+10
3(x+20)=4(x+10)
3x+60=4x+40
4x-3x=60-40
x=20
3/4[(x+30)-10]=x+10
3/4[(x+30)-10]=x+10
數(shù)學(xué)人氣：840 ℃時(shí)間：2020-06-11 02:18:41
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