作业帮x - (x - 120)*60%-120=1/4x
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x - (x - 120)*60%-120=1/4x
x - (x - 120)*60%-120=1/4x
x - (x - 120)*60%-120=1/4x
x - (x - 120)*60%-120=1/4x
x-60%x+72-120=1/4x
40%x-48=1/4x
40%x-1/4x=48
15%x=48
x=320
x - (x - 120)*60%=1/4x
x-0.6x+72=0.25x
0.4x-0.25x=-72
0.15x=-72
x=-480
12x/13+120-x=60
x/(120-x)=(60-x)/60
x/（120-x）=x/60
60%X + 80%X - 12 = X
x^3+12x+47x+60
120+60％x=x
12x（x+x）=60 X=?
x+12x=120
12-x=60%x
(4/x-5)+(x-3)/(12-x)=(x-45)/(x^2-17x+60)
一元一次方程：x-100/50-2=x-100/60+5 x/120-x/130=2 6x+x-1/5+1=100 2x-1/3-10x+1/12=2x+1/4-1
X-X/12-X/7-X/8-X/4-X/20-X/5-30-120-300=50解方程
x*x*x-4x*x+12x分解因式
分解因式：x²-120x+3456.分析：由于常数项数值较大,则采用x²-120x变为差的平方的形式再进行分解,这样简便易行：x²-120x+3456=x²-2*60x+3600-3600+3456=(x-60)²-144=(x-60+12)(x-60-12)=(x-48)(x-72)
x+12%x=48.16 解；120%x=48.16 x= 48.16*120% x=?
x/(x/12+x/15)*(x/12-x/15)=60
(x+x)-12(x+x)+36
|x|-2/x*x-x-12