1.如果(x+1)^5/(-1-x)^4=3x+7,则x=__________
如果3x*x-x=1那么9x*x*x*x+12x*x*x-3x*x-7x+2001等于多少
-sgn(1-x)=__________
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
1.已知:5x^2-4xy+y^2-2x+1=0,则(x-y)^2005+__________.
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
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
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),
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
1x+2x+3x+4x+5x+6x+7x…+99x=100
(X+2)/(X+1)-(X+4)/(X+3)=(X+6)/(X+5)-(X+8)/(X+7)
解方程 x+2/x+1+x+8/x+7=x+6/x+5+x+4/x+3