32.8-9X=17.5

方程X+0.6X=15.6 4（18-x)=32.8 9x=30+6x x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 解方程：8x-3x=105 x-0.36x=16 13.2x+9x=33.3 2x+1.5x=17.5 2x+1.5x= 解方程． 8x-3x=105 13.2x+9x=33.3 2x+1.5x=17.5 x-0.36x=16 6.2x-x= 如果3x*x-x=1那么9x*x*x*x+12x*x*x-3x*x-7x+2001等于多少 X 7 X - X 7 X = X 9 8 X 9 X - X 9 X = 4 9 x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=? 4x+9x=13x y=(x+4)(x+9)/x (x>0) x-3(20-x)=3x-7(9-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),