(1/5+x):2=3/4
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
6/(x+1)=(x+5)/[x(x+1)] (3-x)/(x-4)+1/(4-x)=1 2/(1+x)-3/(1-x)
x(x^2-1)+2x^2 *(x+1)-3x*(2x-5)=x(3x^2-4x)-28
5x-3(2x+1)=6x-4(5-3x)求x
(x+2/x+1)-(x+4/x+3)-(x+3/x+2)+(x+5/x+4)
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
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
计算(x*x+4x+5)/(x+2)-(x*x+6x+10)/(x+3)+1
方程 3x(7-2x)+5x(2x-1)=4x(x-3)+56
设函数f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10),
f(x)=|x+1|+|2x+1|+|3x+1|+|4x+1|+|5x+1|最小值?