120×x÷1-0.2-120x=480解方程!

x(x+1)(x-1)=120 x=120+(x ×0.2) 证明(x+1)(X+3)(x+5)(x+7)+15=(X+8x)+22(x+8x)+120 120×x÷1-0.2-120x=480解方程! x÷(120-x)=20% X=? x - (x - 120)*60%-120=1/4x (X/15+120)/(X+120)=0.2 (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? (0.2-x)(500-100x)=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