化简~sosa^2-2a-3/a^2-7a+12
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化简~sosa^2-2a-3/a^2-7a+12化简~sosa^2-2a-3/a^2-7a+12化简~sosa^2-2a-3/a^2-7a+12a^2-2a-3/a^2-7a+12=(a-3)(a+1
化简~sosa^2-2a-3/a^2-7a+12
化简~sos
a^2-2a-3/a^2-7a+12
化简~sosa^2-2a-3/a^2-7a+12
a^2-2a-3/a^2-7a+12
=(a-3)(a+1)/(a-4)(a-3)
=(a+1)/(a-4)
原式=(a-3)(a+1)/(a-3)(a-4)
=a+1/a-4
化简~sosa^2-2a-3/a^2-7a+12
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