40x-20(50-x)=200
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40x-20(50-x)=20040x-20(50-x)=20040x-20(50-x)=20040X-1000+20X=20060X=1200X=20
40x-20(50-x)=200
40x-20(50-x)=200
40x-20(50-x)=200
40X-1000+20X=200
60X=1200
X=20
40x-20(50-x)=200
5*(x-2)=4*(x+3) 2x+(50-x)*4=140 3x-(8-x)=20*4 200x=(x-0.5)*240 12x+34=14*(x-4)
解方程 40%x=12 (1+60%)x=24 (1-37.5%)x=10 2x+50%x=20 40%x+30%x=140 35%x-15%x=72
x/40+x/50=1+1/200*x
(x+6)/(40+x)=20%求x.
50X=200+X*X
30%x=50%x-20x
20%=(X+4)/(50+X)x=?(50g*8%)+(x*40%)=(50+x)20%,x=?
50%X+20=80%X-40
(X+X*20%)-[(1200-X)-(1200-X)*20%]=40%
X+X*20%-(1200-X)-(1200-X)*20%=40%
50%x+x=20 x+30%x=52
x/(x+200)=20%
x+20%x =40
x+(x-20)=40
x+20%x=40
5x+15x =( + )x =20x
x+(x+20)+(x-10)+70+x=540 .