化简:(1)(x+1)^2-x(x^2+x-1)-(x^2+1)^0(2)(y-2)(y^2-6y-9)-y(y^2-2
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化简:(1)(x+1)^2-x(x^2+x-1)-(x^2+1)^0(2)(y-2)(y^2-6y-9)-y(y^2-2y-15)
![化简:(1)(x+1)^2-x(x^2+x-1)-(x^2+1)^0(2)(y-2)(y^2-6y-9)-y(y^2-2](/uploads/image/z/4117671-63-1.jpg?t=%E5%8C%96%E7%AE%80%EF%BC%9A%281%29%28x%2B1%29%5E2-x%28x%5E2%2Bx-1%29-%28x%5E2%2B1%29%5E0%282%29%28y-2%29%28y%5E2-6y-9%29-y%28y%5E2-2)
(1)解原式=(x²+2x+1)-(x³+x²-x)-1
=x²+2x+1-x³-x²+x-1
=-x³+3x
(2)解原式=y(y²-6y-9)-2(y²-6y-9)-y(y²-2y-15)
=y³-6y²-9y-2y²+12y+18-y³+2y²+15y
=-6y²+18y+18
=-6×1/4+18×1/2+18
=-3/2+9+18
=51/2
=x²+2x+1-x³-x²+x-1
=-x³+3x
(2)解原式=y(y²-6y-9)-2(y²-6y-9)-y(y²-2y-15)
=y³-6y²-9y-2y²+12y+18-y³+2y²+15y
=-6y²+18y+18
=-6×1/4+18×1/2+18
=-3/2+9+18
=51/2
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