96/(X+12)+40/60=96/X 怎么做. - 知识问答

96/(X+12)+40/60=96/X 怎么做...要过程~

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96/(X+12)+40/60=96/X
96/(X+12)+2/3=96/X
3x*96+2x(x+12)=96*3(x+12)
288x+2x²+24x=288x+3456
2x²+24x-3456=0
x²+12x-1728=0
(x-36)(x+48)=0
x=36,x=-48

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