作业帮3x²-9x-12/x²+2x+1将其化简?
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3x²-9x-12/x²+2x+1将其化简?
3x²-9x-12/x²+2x+1将其化简?
3x²-9x-12/x²+2x+1将其化简?
3x²-9x-12/x²+2x+1
=3(x+1)(x-4)/(x+1)²
=(3x-12)/(x+1)
(3x²-9x-12)/(x²+2x+1)
=[3(x²-3x-4)]/(x²+2x+1)
=[3(x+1)(x-4)]/(x+1)²
=[3(x-4)]/(x+1)
原式=3（x+1）（x-4）/(x+1)(x+1)=3（x-4）/(x+1)