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)
问题描述:
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)
答
(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+...