x+6x=8.4 2.4x+x=27.2 9x-4.2x=24 x-0.6x=4.8 8.6x-4.6x=10.4 7x

x+6x=8.4 2.4x+x=27.2 9x-4.2x=24 x-0.6x=4.8 8.6x-4.6x=10.4 7x （X+X)+(X-X)+(X*X)+(X/X)=100 x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+. x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求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+x=x+15 已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值 2x+3x+4x+5x+x+6x+7x=100 (x-22)+(x-24)+(x-27)+(x-20)=x X 7 X - X 7 X = X 9 8 X 9 X - X 9 X = 4 9 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