x-1/4x=1/2 16x（3-2/9） x-0.8x=22

（1） x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8 x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x x-1/4x=1/2 16x（3-2/9） x-0.8x=22 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), (4x+2)/x+(4x-22)/(x-5)=(x-6)/(x-4)+(7x+9)/(x+1) 六道解方程4×（0.8-x）=1.45+2/3x-1/2x=1210x+9=8x+19115%x+15%x=1.32x- x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 1、x*(x+3)*(x+6)*(x+9)=68040 2、x*(x+1)*(x+2)*(x+3)*（x+4）=5544 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