作业帮(x-120)/120=(120+x-100)/(x-120+100)
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(x-120)/120=(120+x-100)/(x-120+100)
(x-120)/120=(120+x-100)/(x-120+100)
(x-120)/120=(120+x-100)/(x-120+100)
（x-120)(x-120+100)=120(120+x-100)
x=260
x(x+1)(x-1)=120
证明(x+1)(X+3)(x+5)(x+7)+15=(X+8x)+22(x+8x)+120
x(120+x)*80％=x-76
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
x - (x - 120)*60%-120=1/4x
120/x+1=120/1.5x
120/(x+20)+1=120/x
(x+60)x(1+10%)-(1-20%)x=120
x(x-1)(x+1)=120怎么解方程
SOS:解方程X-1*X*X+1=120
x(x-1)(x-2)=120怎么解?
x+2/3x=60 x-3/5x=120 4x+18x=1x+2/3x=60 x-3/5x=120 4x+18x=132!
X-9分之1X=120