化简1/(x-1)(x+1)+1/(x+1)(x+3)+1/(x+3)(x+5)

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化简1/(x-1)(x+1)+1/(x+1)(x+3)+1/(x+3)(x+5)

化简1/(x-1)(x+1)+1/(x+1)(x+3)+1/(x+3)(x+5)
化简1/(x-1)(x+1)+1/(x+1)(x+3)+1/(x+3)(x+5)

化简1/(x-1)(x+1)+1/(x+1)(x+3)+1/(x+3)(x+5)
=x+3+x-1/(x-1)(x+1)(x+3)+1/(x+3)(x+5)
=2(x+1)/(x-1)(x+1)(x+3)+1/(x+3)(x+5)
=2/(x-1)(x+3)+1/(x+3)(x+5)
=2x+10+x-1/(x+3)(x-1)(x+5)
=3/(x-1)(x+5)