2x^2-3x-2＞0

(x-2)(x-3)/(x+5)(x-7)＞0 不等式|(x+3)/x|>(x+3)/x,不等式（x²-9）/(x-2)＞0 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 1.(x³-4x²+4x)(3+2x-x²)＞0 (x+2)(x-3)(x-6)(x-1)=0 lim(x->0)((2-x)/(3-x))^1/x (x+2)(x-3)>0 已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值 已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^+x^6+x^7+x^8的值 x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2) (x-1)(x-2)(x+3)(x+4)>0和(x-1)(x-2)(x+3)(x+4)