40x+40[2x+0.11]=258.8 列式

x+40=2x x=? x-40%x= x{x+1}{x-1}}x-2}{x-3}-40 (35-X)*(40-2X)+40X+2X*(35-X)=35*40 解分式方程：1/X-2+1/X-6=1/X-7+1/X-11/X-2+1/X-6=1/X-7+1/X-11/(x-2)-1/(x-1)=1/(x-7)-1/(x-6)(x-1-x+2)/(x-2)(x-1)=(x-6-x+7)/(x-7)(x-6)1/(x-2)(x-1)=1/(x-7)(x-6)(x-2)(x-1)=(x-7)(x-6)x^2-3x+2=x^2-13x+4213x-3x=42-210x=40x=4 为什么要移向才能解 20/(x-20)=(2x-40)/(x+40) x^3 - 13x^2 + 40x - 40 =0 x-40%x-40%x=15 x(40-2x)=200 x=? 2x/40%=x+20x=? 2（15+2x）x+40x=246 X-40%X+1200=2/3X怎么算 40-2x=60-4x x等于多少? x-(x/2-40)-(x/4+60)=60求解 x（40-2x）=250求x X+(X+40)+(2X-20)=320 x^2- +40=(x-5)(x-8) 18x+[5-x]2=40+6x