x+18 120设宽是X[X+18]*2*2=120X=12即每个的宽是12厘米

(x^2-x)^2-18(x^2-x)+72(x+1)(x+2)-x-10 因式分解(x+1)(x+2)-x-10(x²-x)²-18(x²-x)+72 35道.符号^代表平方.读起来就是（X的平方）.1,x^-x-202,x^-9x+203,x^-9x-204,x^+9x+205,x^-18x+326,x^+14x-317,x^+18x+328,x^+14x-329,x^+19x+4810,x^+47x-4811,x^+13x-4812,x^+2x-4813,x^+26x+4814,x^-22x-4815,x^+17x+7216,x^+21x-10017,x^-x-7218,x 求几道因式分解!x^2+9x+20x^2-5x+6x^2+x-2x^2+x-2x^2+x-2x^2-3x-18-x^2+7x-12-x^2-x+62x^2-4x-30-5x^2+25x+120 x^3-18x^2+81x 90-x=2x(18+x) x/(x^2+6x+18)=? x+2/3x=60 x-3/5x=120 4x+18x=1x+2/3x=60 x-3/5x=120 4x+18x=132! x+3分之2 x=60 x-5分之3x=120 4x+18x=132x+3分之2 x=60 x-5分之3x=120 4x+18x=132 x+2/3x=60 x-2/5x=120 4x+18x=132 （x^2-x)^2-18(x^2-x)+72 因式分解 (x^2-x)^2-18(x^2-x)+72因式分解 x+(x+3)+2x+(2x-18)=255 x^2=(x+30)X(x-18)怎么解 (x+30)*(x-18)=x*x x^2-3x-18 2*x*x*x-6x*x+18x怎么因式分解? 60％x+25=40 x+30％x=52 19-120％x=7 4分之3x-5％x=17.5 x-10％x=18 （1-25％）x=36 2x+30％x=9.2