2x-5+10=x+25

解方程：（2x+5)(4x*x-10x+25)=8x(x*x+1) (x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 (x+5)²-(x-2)(x-3) =x²+10x+25-(x²-5x+6) *5x怎么来 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), 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 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 10x+2x的平方=25-5x x=? x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x 解下列方程：① 3/(x+5)+10/(x^2-25)=1/(x-5) ② 5/(x^2+x)+3/(x^2-x)=7/ 解方程 2x的平方+3x=3 ； x的平方-2x+1=25 ；x(2x-5)=4x-10