5（x-4)=5x(20-4)

x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x 4x-3x(20-x)=5x-7x(20-x) 4x-3x(20-x)=5x-7x(20-x)的解法 x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 2x+3x+4x+5x+x+6x+7x=100 x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=? 提取公因式:已知x*x-5x+1=0 求x*x*x-4x*x-4x-1 x-y+5x-4x= ? 4x+5x=20 x=? 4x-3(20-x)=5x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),