9x+27=812.5x-12=460.5X(7x+28x)=14.7(4x-4.8)÷4=12442.2X2-5.8x
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
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+2)(x2-2x+4)+(x-1)(x2+x+1),其中x=-三分之二
(X+X)+(X-X)+(X*X)+(X/X)=100
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
如果3x*x-x=1那么9x*x*x*x+12x*x*x-3x*x-7x+2001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
1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)=1/(x+4)
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),
x(2x-1)2-4(x-3)(x2+3x+9)-(9+2x)(9-2x)=0
(4x+2)/x+(4x-22)/(x-5)=(x-6)/(x-4)+(7x+9)/(x+1)