6x+10*(1/12-x)+11/30=1

1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 x/2+x/6+x/12+x/20+x/30+x/42=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 求x^2-3x/x^2-6x+9*x^2-11x+30/x^2-5x-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), 解方程:x(x-1)/1+x(x+1)/1…+(x+9)(x+10)/1=11?12 X/2+X/6+X/12+X/20+X/30+X/42=1用简便方法解 x-1=3x+3 x-3=12-4x 6x-14=5x-10 x+1=2-4x 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 4(x+3)=2x+2 7（x-1）=2x+3 4x+20=6x-30 4x-12=2x 2x-3=x+7 3x-4=2 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