(x-1)(x²+2x-3)=
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
①2(x+3)(x-3)=x²+(x-1)(x+1)+2x
5x²+[x²+(5x²-2x)]-2(x²-3x),其中x=-1
化简求值:x²(x²-x-1)-x(x²-3x),其中x=-2
先化简在求值(x-1/3x-x+1/x)*x/x²-1,其中x=√2-3
解方程:x(6-x)-2x(x+1)-(x^3-3x^4)/x²=4
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)
x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002
(x+1-1/1-x)÷(x-x²/x-1) (x-4/x-x-6+ x+2/x-3)÷x+1/x-3
2X²-X=6,4X²-3X-1=X-2,3X(X-3)=2(X-1)(X+1),
2f(x)+x^2f(1/x)=(3x³-x²+4x+3)/(x+1) 2x²f(1/x)
解方程 (3x+1)(3x-1)=(x+2)(9x-4) 2(x-3)(x-2)-(x+3)²=(x-1)(x