(X/15+120)/(X+120)=0.2
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(X/15+120)/(X+120)=0.2(X/15+120)/(X+120)=0.2(X/15+120)/(X+120)=0.2(X/15+120)/(X+120)=0.2x=720x=720
(X/15+120)/(X+120)=0.2
(X/15+120)/(X+120)=0.2
(X/15+120)/(X+120)=0.2
(X/15+120)/(X+120)=0.2
x=720
x=720
证明(x+1)(X+3)(x+5)(x+7)+15=(X+8x)+22(x+8x)+120
(X/15+120)/(X+120)=0.2
x(120+x)*80％=x-76
x(x+1)(x-1)=120
x-x/4-120=x/2
0.5X+120+0.3X=X
x/（120-x）=x/60
x/(120-x)=(60-x)/60
25%X+三分之一X+120=X
536-120%x-x=x-80
150%×（15-x )=120%x
0.25x=0.125(120-x)+15
x^2+14x-120=0
证明(x+1)(x+3)(x+5)(x+7)+15=(x^2+8x)^2+22(x^2+8x)+120
x-(20%x+55%x)=120 X是什么
(168+X)/(288+X)=(120-X)/X怎么解
x-20%x=120,
x*(39-x)=120