(0.3x+18)/(0.7x-18)怎样算

x-0.7x=18 x-0.7x等于18 8x-5.5x=7.57.2x÷3.6=2 3x＋6x-8x=0.7 12x-2x-5x=4.512x-x=0 5x＋x=1.8 3.2x＋1.8x=64.8x-0.8x=6 6.3-0.3x=9.6 8.6x-8.5x=0.720x-2x=36 9x＋6x=4.5 18x-12x=5.42x-1.6x=3.6 18x＋3x=7×6 1.2x-0.5x=0.71.3x＋2.7x=1 4x-3.2x=6.4 0.8x＋3.2x＋3x=562.8x-2x=7.2 (x+30)*(x-18)=x*x (0.3x+18)/(0.7x-18)怎样算 0.5分之x=0.3分之x-18 x=? 1.6x+2x*0.7=18 因式分解(x+1)(x+2)-x-10(x²-x)²-18(x²-x)+72 (x^2-x)^2-18(x^2-x)+72(x+1)(x+2)-x-10 x^3-18x^2+81x 90-x=2x(18+x) x/(x^2+6x+18)=? x平方+x=18,求x 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 6x+3x=13.51.x+0.3x=248x-3x=21.05x+2x=907.7+3x=12.28*2.5-2x=13.67x-2*18=27 解方程一.0.2x=0.25x-18 二.0.3x+x=69 解方程一.0.2x=0.25x-18 二.0.3x+x=69 x^2=(x+30)X(x-18)怎么解