1.若x>5时,化简|x-5|-|2x-13| 2.|3x-2|+|2x+3| 3.||x-1|-3|+|3x+1|
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)
5x(3x-2)-(x+1)
化简3x^2(x-1)-3x(x^2+1)+4x(2X-5)
化简x(x-2)+2x(x+1)-3x(2x-5)
化简 x(x-1)+2x(x+1)-3x(2x-5)
化简x(x-1)+2x(x+1)-3x(2x-5)
x-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
(X-1)^3(x-2)(x-3)^2(x-5)