10+7x/100+14x=0.25

1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 （X+X)+(X-X)+(X*X)+(X/X)=100 2x+3x+4x+5x+x+6x+7x=100 (x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 X>7,x=100 x 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-4/x-6+x-8/x-10=x-5/x-7+x-7/x-9 1x+2x+3x+4x+5x+6x+7x…+99x=100 (x+7/x+6)+ (x+9/+x+8)=(x+10/x+9)+(x+6/x+5) 1.x+9/x+8- x+10/x+9=x+6/x+5- x+7/x+6； ⒈ 解方程 (X+7)/(X+6)+(X+9)/(X+8)=(X+10)/(X+9)+(X+6)/(X+5)