(1/8+1/9+1/10+1/11)X(1/9+1/10+1/11+1/12)-(1/8+1/9+1/10+1/11+

来源：学生作业帮编辑：拍题作业网作业帮分类：数学作业时间：2024/06/17 09:15:30

(1/8+1/9+1/10+1/11)X(1/9+1/10+1/11+1/12)-(1/8+1/9+1/10+1/11+1/12)X(1/9+1/10+1/11)

令a=1/9+1/10+1/11
(1/8+1/9+1/10+1/11)X(1/9+1/10+1/11+1/12)-(1/8+1/9+1/10+1/11+1/12)X(1/9+1/10+1/11)
=(1/8+a)*(a+1/12)-(1/8+a+1/12)*a
=(1/8+a)*(a+1/12)-(1/8+a)a-1/12*a
=(1/8+a)*a+1/12*(1/8+a)-(1/8+a)a-1/12*a
=1/12*(1/8+a)-1/12*a
=1/12*1/8+1/12*a-1/12*a
=1/96

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| 解方程:x(x-1)/1+x(x+1)/1…+(x+9)(x+10)/1=11?12 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 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+7/X+1+X+8/X+2-X+9/X+3-X+10/X+4 的解法 1+2x+3x^2+4x^3+5x^4+6x^5+7x^6+8x^7+9x^8+10x^9+11x^10当x=-1时的值设函数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()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?是多少求x^2-3x/x^2-6x+9*x^2-11x+30/x^2-5x-1