x(x+4)=8x+12
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2
x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=?
X 7 X - X 7 X = X 9 8 X 9 X - X 9 X = 4 9
解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1
x-x/5=2.4 (求未知数x) 12÷5%x=8 4x+x=12.5
x/2+x/8+x/12+x/20=1
(x-3.6)/4=(x+4.8)/8x 求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),