4x^2=（x-1)^2 x^3-9x=x^2-9

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4x^2=（x-1)^2 x^3-9x=x^2-9
2道题目连一起了，我把第2题单独发出来 x^3-9x=x^2-9

1.
4x^2=x^2-2x+1
3x^+2x-1=0
(3x-1)(x+1)=0
x=1/3或x=-1
2.
x^3-x^2-9x+9=0
x^2(x-1)-9(x-1)=0
(x-1)(x^2-9)=0
(x-1)(x+3)(x-3)=0
x=1或x=-3或x=3

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 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), （1） x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8 x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| 1x()+2x()+3x()+4x()+5x()+6x()+7x()+8x()加9x()+10x()=1980 1X?+2X?+3X?+4X?+5X?+6X?+7X?+8X?+9X?+10X?=1980求?是多少 (4x+2)/x+(4x-22)/(x-5)=(x-6)/(x-4)+(7x+9)/(x+1) x+2/x+3－x+1/x+2=x+8/x+9－x+7/x+8 解方程】(x+8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)