llim x→∞[(2X+10)^10*(x+9)^50]/(x^60+8x^50)

llim x→∞[(2X+10)^10*(x+9)^50]/(x^60+8x^50) |X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| 这里有两个题目.llim(x-2)/(x^2-4)\x0clim(1+(2/x))^3x\x0cy=x^2sinx,求y 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), X+7/X+1+X+8/X+2-X+9/X+3-X+10/X+4 的解法 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 x*x+2x+x*x+10x+x*x+25+2x+x*x+1+1+16+x*x+4x*x+9-12x+16x*x+4-1 (x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 1x()+2x()+3x()+4x()+5x()+6x()+7x()+8x()加9x()+10x()=1980 (x+1)(x+2)(x+3)(x+4)(x+5)(x+6)(x+7)(x+8)(x+9)(x+10)请化简 1X?+2X?+3X?+4X?+5X?+6X?+7X?+8X?+9X?+10X?=1980求?是多少