81/10 ÷x=18/5

(x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 X+5X=18 当x=9/2时,求(x^2+7x+10)/(x^2+6x+5)×(x^3+1)/(x^2+4x+4)÷(x^2-x+1) 12分之10X-18分之5X*X=12分之5-48分之5X*X 解方程 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+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) x-4/x-6+x-8/x-10=x-5/x-7+x-7/x-9 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 x+5.7=10 x -6.2=10.5 3x=10.5 x÷7=54-5 4x+6=16 5x+x=12 7x-2x=