x-2(1-2x+x2)+3(-2+3x-x2

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x-2(1-2x+x2)+3(-2+3x-x2x-2(1-2x+x2)+3(-2+3x-x2x-2(1-2x+x2)+3(-2+3x-x2x-2(1-2x+x2)+3(-2+3x-x2）=x-2+4x

x-2(1-2x+x2)+3(-2+3x-x2
x-2(1-2x+x2)+3(-2+3x-x2

x-2(1-2x+x2)+3(-2+3x-x2
x-2(1-2x+x2)+3(-2+3x-x2）
=x-2+4x-2x^2-6+9x-3x^2
=-5x^2+14x-8
=-（x-2)(5x-4)

(x2-3x)2-x(x2-3x)-2x2 3/x2 -3x+2-1/x-2=1/x2 -x+4/x2 -2x 通分 3x/x2-2x,2x+1/4-x2,3/2x2+4x (x+1)(x2-x+1)+(x-2)(x2+2x+4),其中x=-3/2 2x-(3x-1)+2(x2) 2-3X/X2+X+1>3 （x-1)(x2-3x+2) x2-2x-3 X2-2X-3 -x2+2x-3 (x-x2)(x2+x-6)分之(x2+3x)(x2-3x+2) 填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x x2-3x+2/x2-2x-3x 计算:x2-5x+6/x2-4x+3 + x2-4x+3/x2-2x+1 + x2-3x-4/1-x2 化简1/x2-3x+2 +1/x2-x +1/x2+x +1/x2+3x+2 (X2-X)2+(X2+3X+2)2-4(X2+X+1)2因式分解分解因式:4(3x2-x-1)(x2+2x-3)-(4x2+x-4)2 先化简,再求值：（4x2-3x)-2（x2+2x-1)-（x2+x-1)