x/20=x/30+4
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x/20=x/30+4
x/20=x/30+4
x/20=x/30+4
两边乘60
3x=2x+4*60
3x-2x=240
x=240
X-X/12-X/7-X/8-X/4-X/20-X/5-30-120-300=50解方程
(16x-13)/(4x-3)-(20x-24)/(4x-5)=(32x-30)/(8x-7)-(40x-43)/(8x-9)求x
4x/20=30-3x/3x
X-30%X+8-X=20
30%x=50%x-20x
60x(x-4)=30x
x*x*(1/4)=20x
x/20=x/30+4
4x+30%*x=129/20
(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)
20%x+20%x×30%x-20%x=4.5
50%x+x=20 x+30%x=52
x-30%x=14x+25%x=20
x/6+x/12+x/20+x/30=1
(30-x):(18+x)=(20+x):(32-x)
4x-3x(20-x)=4求x
4x-3x(20-x)=5x