(1-9/10)X+12=1/5*9/10X怎么解

1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 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), 5x-4/x-2=4x 10/3x-6-1 怎么解 根号下(5x^2+10x+1)+x^2+2x=7怎么解 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 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 x(x-1)分之一+x(x+1)分之一+········+(x+9)(x+10)分之一=12分之11 怎么算? 解方程:1/[x(x+1)]+1/(x+1)(x+2)+1/(x+2)(x+3)+.+1/(x+9)(x+10)=5/1