化简1/x2-3x+2 +1/x2-x +1/x2+x +1/x2+3x+2

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化简1/x2-3x+2 +1/x2-x +1/x2+x +1/x2+3x+2

化简1/x2-3x+2 +1/x2-x +1/x2+x +1/x2+3x+2
化简1/x2-3x+2 +1/x2-x +1/x2+x +1/x2+3x+2

化简1/x2-3x+2 +1/x2-x +1/x2+x +1/x2+3x+2
=1/(x-2)(x-1)+1/(x-1)x+1/x(x+1)+1/(x+1)(x+2)=1/x-2-1/x-1+.+1/x+1-1/x+2=1/x-2-1/x+2=4/x^2-4

=1/(x-2)(x-1) +1/x(x-1) +1/x(x+1) +1/(x+2)(x+1)
=[x+(x-2)]/x(x-2)(x-1) +[(x+2)+x]/x(x+1)(x+2)
=2(x-1)/x(x-2)(x-1) +2(x+1)/x(x+2)(x+1)
=2/x(x-2) +2/x(x+2)
=[2(x+2)+2(x-2)]/x(x+2)(x-2)
=4x/x(x+2)(x-2)
=4/(x平方-4)