(30-x)/(40-x)=3/5
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(30-x)/(40-x)=3/5(30-x)/(40-x)=3/5(30-x)/(40-x)=3/5两边乘5(40-x)150-5x=120-3x2x=30x=15
(30-x)/(40-x)=3/5
(30-x)/(40-x)=3/5
(30-x)/(40-x)=3/5
两边乘5(40-x)
150-5x=120-3x
2x=30
x=15
(16x-13)/(4x-3)-(20x-24)/(4x-5)=(32x-30)/(8x-7)-(40x-43)/(8x-9)求x
(30-x)/(40-x)=3/5
3/5*(40-x)=30-x
（16x-13)/(4x-3)+（40x-43)/(8x-9)=（32x-30)/(8x-7)+（20x-24)/(4x-5)....
（16x-13)/(4x-3)+（40x-43)/(8x-9)=（32x-30)/(8x-7)+（20x-24)/(4x-5)
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