x^5 - x^4 - 1
= x^5 - x^3 - x² - x^4 + x² + x + x^3 - x - 1
= x²( x^3 - x - 1 ) - x( x^3 - x - 1 ) + ( x^3 - x - 1 )
= ( x² - x + 1)( x^3 - x - 1 )
x5-x4-1=x5-x4+x3-x3-1=x3(x2-x+1)-(x3+1)=x3(x2-x+1)-(x+1)(x2-x+1)=(x3-1)(x2-x+1)=(x-1)(x2+x+1)(x2-x+1)
khó quá tui ko biết làm..
k cho tui nha
thanks
khó quá tui ko biết làm..
k cho tui nha
thanks