(x+2/x-2-x-2/x+2)-x2/x2-4

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(x+2/x-2-x-2/x+2)-x2/x2-4
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(x+2/x-2-x-2/x+2)-x2/x2-4
(x+2/x-2-x-2/x+2)-x2/x2-4

(x+2/x-2-x-2/x+2)-x2/x2-4
=[(x+2)²-(x-2)²]/(x+2)(x-2)-x²/(x+2)(x-2)
=(x+2+x-2)(x+2-x+2)/(x+2)(x-2)-x²/(x+2)(x-2)
=4x/(x+2)(x-2)-x²/(x+2)(x-2)
=-(x²-4x)/(x²-4)

通分得出=[(x+2)^2-(x-2)^2-x^2]/(x^2-4)=(4x-x^2)/(x^2-4)

(x2-3x)2-x(x2-3x)-2x2 约分x2+x-2/x2-x-6 (x2-x)2+6(x2-x)+9 化简x/x2+x除以x2+x-2/x2-1+x+1/x+2 x2-2x-3 x2+x-2因式分解 X2+2X+a x2-x-2因式分解 X2-2X-3 x2-x+2 -x2+2x-3 x2-2x-24 x2+x-2 (x-x2)(x2+x-6)分之(x2+3x)(x2-3x+2) 因式分解 (x2-2x-x)(x2-2x+4)+9 x2-3x+2/x2-2x-3x 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 函数f(x)=(x2-2x+9)/x(x