13^2-x^2=15^2-(14-x)^2
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
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
x^15+x^14+x^13+x^12……+x^2+x+1 分解因式
2x+(14-x)=x+14
(x^3)^()*x^2=x^14
(2x^-5x+2/6x^+13x+6)*(6x^-5x-6/6x^-17x+10)*(12x^+8x-15/2x^-x
x^15+X^14+X^13+……+x^2+X+1
x^15+x^14+x^13+…+x^2+x+1因式分解
x^3+x-30(分解因式);x^12-y^12;x^15+x^14+x^13.x^2+x+1
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
解方程((13x-x^2)/(x+1))(x+(13-x)/(x+1))=42
(13x-x^2)/(x+1)[x+(13-x)/(x+1)]=42