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^2-2y-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^2-2y-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^2-2y-15)
（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

原式=y(y²-6y-9)-2(y²-6y-9)-y(y²-2y-15)
=y³-6y²-9y-2y²+12y+18-y³+2y²+15y