8/9(x+2)²=1/2(3x+1)²
9x+6x²-3(x-2/3x²),其中x=-2 1/4(-4x²+2x-8)-(1/2x
x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)
解方程 (3x+1)(3x-1)=(x+2)(9x-4) 2(x-3)(x-2)-(x+3)²=(x-1)(x
3X+(X+2)+(X+1)*(X-1)=4*(X²+8)
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
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
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+2/x+3-x+1/x+2=x+8/x+9-x+7/x+8
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
①2(x+3)(x-3)=x²+(x-1)(x+1)+2x
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
(x+1)(x+2)(x+3)x+1=0则3x²+9x+7