x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
如果3x*x-x=1那么9x*x*x*x+12x*x*x-3x*x-7x+2001等于多少
x-2/(x^2-9)(1+(2x-7/x^2-4x+4)÷(x+1)/(x+3)其中x=2010
X 7 X - X 7 X = X 9 8 X 9 X - X 9 X = 4 9
x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=?
X÷(X-9)=3.25 (X-7)÷(45-X)=1
1.25-x=2.8 2.36÷x+9=0 3.33x=79-x 4.5x-(11-7)=x+3 5.169÷(x+9)
5x÷8-3x=40 7x-8=42+3x 9x+7-3x=9x-3
x-3(20-x)=3x-7(9-x)
解方程 5x=80 43-x=38 20-x=9 6.3÷x=7 x
当x=9/2时,求(x^2+7x+10)/(x^2+6x+5)×(x^3+1)/(x^2+4x+4)÷(x^2-x+1)
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