7×(x÷9)＝0.5x+4+1

|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| 1. x+0.5x=6 4x+16=40 x/5=32% x-4/9x=10/21 x-1/8x=5/8 7x÷2=2. 2-x/x²-9(1+2x-7/x²-4x+4)÷1/x+3 x-2/(x^2-9)(1+(2x-7/x^2-4x+4)÷(x+1)/(x+3)其中x=2010 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), 方程x+1x+2+x+8x+9＝x+2x+3+x+7x+8 (4x+2)/x+(4x-22)/(x-5)=(x-6)/(x-4)+(7x+9)/(x+1) （1） x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8 X+7/X+1+X+8/X+2-X+9/X+3-X+10/X+4 的解法 1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550 x^2-x/x+1÷x/x+1 ；x^2+6x+9/x^2-9÷x+2/x-3；2/a÷4/a