5x-39=56 7x÷3=8.19

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!)+. 3x(7-2x)+5x(2x-1)=4x(x-3)+56 x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 3x(7-2x)+5x(2x-1)=4x(x-3)+56 求X的值 2x+3x+4x+5x+x+6x+7x=100 已知3x*x-x=1,求6x*x*x+7x*x-5x+2000 (2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1 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 已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值 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+3/x+1-x+5/x+3-x+7/x+5+x+9/x+7=0 解方程：3x(5-3x)-39=2x(7-2x)+5x(8-x)