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
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)
2x+3x+4x+5x+x+6x+7x=100
方程(x+1)(x+2)(x+3)(x+4)(x+5)(x+6)(x+7)(x^2+8x+9)+64=0
已知2x*x+x-5=0,求代数式6x*x*x+7x*x-13x+11的值
x-4x-5=0 x(x-2)=3x-6
解方程:(4/x-2)+(x-1/x-5x+6)+(2/3-x)=0
x^2+5x-990=0,求x^3+6x^2-985x+2010
x³+2x²-5x-6=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