化简分式:1/(x²+3x+2)+1/(x²+5x+6)+1/(x²+7x+12)

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化简分式:1/(x²+3x+2)+1/(x²+5x+6)+1/(x²+7x+12)

化简分式:1/(x²+3x+2)+1/(x²+5x+6)+1/(x²+7x+12)
化简分式:1/(x²+3x+2)+1/(x²+5x+6)+1/(x²+7x+12)

化简分式:1/(x²+3x+2)+1/(x²+5x+6)+1/(x²+7x+12)
原式=1/(x+1)(x+2)+1/(x+2)(x+3)+1/(x+3)(x+4)
=1/(x+1)-1/(x+2)+1/(x+2)-1/(x+3)+1/(x+3)-1/(x+4)
=1/(x+1)-1/(x+4)
=3/(x²+5x+4)

=1/(x+2)(x+1)+1/(x+2)(x+3)+1/(x+3)(x+4)
=1/(x+1)-1/(x+2)+1/(x+2)-1/(x+3)+1/(x+3)-1/(x+4)
=1/(x+1)-1/(x+4)
=1/(x²+5x+4)