-更号下2x+9乘更号下x-3=0
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(3x^2+9x+7)/(x+1)-(2x^2+4x-3)/(x-1)-(x^3+x+1)/(x^2-1)=0
1/x+1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)+...1/(x+9)(x+10)=0
方程(x+1)(x+2)(x+3)(x+4)(x+5)(x+6)(x+7)(x^2+8x+9)+64=0
解方程4x^2+2x√(3x^+x)+x-9=0
x^4+x^3+x^2+x+1=0,x^2006+x^2005+x^2004+x^2003+x^2002
X^3 + 3(X^2)-3X-9=0
2x^3-9x^2-5x=0
2x^3-6x^2-3x+9=0 X^3-3x-2=0 X^4-3x^2+2x^2-6x=0 X^5-6x^3+9x=0
x(2x-1)2-4(x-3)(x2+3x+9)-(9+2x)(9-2x)=0
已知2x-3=0,求代数式x(x^3-x)+x^2(5-x)-9的值
(x+1)(x+2)(x+3)x+1=0则3x²+9x+7