x+1/2-x≥-2
已知函数f(x)=x²+x+1,x≥0;2x+1,x
x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
{2X+1}+{X}
x^2-|x|+1
|x-1|+|x-2|
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
(1)3x/(x+2)>x+6;(2)x+1+5x^2/(x+2)≥1/(1-x);
设函数f(x)={(x-2)2,x>1:x,-1≤x≥1:x+1,x
化简:x(x^2+x)/x^2(x^2-1)
x/x平方-x+2=2x/x+1
1、x(x-y)(x+y)-x(x+y)^2