(x-2)(x+2)≦2(x²+4)-(x+5)(x+3)-17,
(x+2/x+1)-(x+4/x+3)-(x+3/x+2)+(x+5/x+4)
计算(x*x+4x+5)/(x+2)-(x*x+6x+10)/(x+3)+1
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
(x-2)(x+2)≦2(x²+4)-(x+5)(x+3)-17,
f(x)=x²+3x|x-2|
(x-1)^3(x+1)(x-2)/(x+4)
(x+1)(x+2)(x+3)(x+4)+1
(先化简后求值)(3x/x+2-x/x-2)+2x/x^2-4,x=4-根号5,
(2x-6)/(x²-4x)/(X+3)*( x²+x-6)/(3-x)等于多少?
化简{x²-2x分之x+2-x²-4x+4x分之x-1}除以X分之(x-1)(X-4)乘以(2-x)
3x²-【5x²+(3x²-2x)-(2x²-4x)】 化简
4x/(x²+x+3) + 5x/(x²-5x+3)= - 3/2