1/4+2x=1/25x-5/6=5/122/3x-3/5x=1x+7/9x=4/320x-100(250-x)=440
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
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
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),
1x+2x+3x+4x+5x+6x+7x…+99x=100
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
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
解方程:2x+4x+6x...+100x=1-(x+3x+5x+...+99x)
(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
(x-1)(x-2)(x-3)(x-4)=(x+5)(x+6)(x+7)求X等于几?