x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
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
解分式方程 x-7/x-9+x-3/x-5=x-4/x-6+x-6/x-8
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),
解方程:(x+3)/(x+2)-(x+5)/(x+4)=(x+7)/(x+6)-(x+9)/(x+8)
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
解方程(x-2)X(x的平方-6x-9)=x(x-5)X(x-3)
2x/x^2-9=x-1/x^2-6x+9-1/x+3
(x-2)(x2-6x-9)-x(x-5)(x-3)其中x= -1/3
解方程:(x-2)(x^2-6x-9)=x(x-5)(x-3)
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
a*b=2×a+b 计算x*2x*3x*4x*5x*6x*7x*8x*9x=3039 x=