x²-x+2=0则x³+2x²-x

f(x)为奇函数,x>0,f(x)=sin 2x+cos x,则x f(x)=｛x^2+x(x≤0),-x^2+x(x＞0) x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002 x^3+x^2+x+1=0,则x^97+x^98+x^99+.x^103= 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 解不等式(x²-2)³-x³+2x²-2x-4>0 已知x²-5x=14,求(x-1)(2x-1)-(x+1.. x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x 解方程 x*x*x + 2*x -19 =0 (x+2)(x-3)(x-6)(x-1)=0 x不等于0,且x+1/x=5 则x^2+1/x^2= 已知x>0,则函数f(x)=(2x^2+7x+10)/x