2x(2x-5)(2x+5)-(1+2x)(1-2x+4x2)=24
(x-2)(x2-6x-9)-x(x-5)(x-3)其中x= -1/3
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
(x+2)(x2-2x+4)+(x-1)(x2+x+1),其中x=-三分之二
解方程:1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x
1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)=1/(x+4)
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
已知X2-5X=3,求(X-1)(2x-1)-x(x+3)+15/x2-3的值
化简求值:[3x/(x-1)-2x/(x+1)*(x2-1)/x 其中x=根号5 -5
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
解方程x-4/x2+x-2=1/(x-1)+(x-6)/(x2-4)
已知x2-5x=14,求2x2-x-2x+1-[x2+2x+1]+1的值.
(x2+3x+9)/(x2-27)+(6x)/(9x-x2)-(x-1)/(6+2x)