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x^4+x^2+1 = (x^4+2x^2+1)-x^2 = (x^2+1)^2-x^2 = (x^2-x+1).(x^2+x+1)
k mk nha
x5-x4-1=x5-x3-x2-x4+x2+x+x3-x-1
=x2.(x3-x-1)-x.(x3-x-1)+(x3-x-1)
=(x3-x-1)(x2-x+1)
x^4+x^2+1 = (x^4+2x^2+1)-x^2 = (x^2+1)^2-x^2 = (x^2-x+1).(x^2+x+1)
k mk nha
x^10+x^5+1
=x10-x+x5-x2+x2+x+1
=x.(x9-1)+x2.(x3-1)+(x2+x+1)
=x.(x3-1)(x3+1)+x2(x3-1)+(x2-x+1)
=x.(x-1)(x2+x+1)(x3+1)+x2(x-1)(x2+x+1)+(x2+x+1)
=(x2+x+1)[x.(x-1)(x3+1)+x2(x-1)+1]
=(x2+x+1)(x5+x2-x4-x+x3-x2+1)
=(x2+x+1)(x5-x4+x3-x+1)
x^10+x^5+1
=x10-x+x5-x2+x2-x+1
=x.(x9-1)+x2.(x3-1)+(x2+x+1)
=x.(x3-1)(x3+1)+x2(x3-1)+(x2-x+1)
=x.(x-1)(x2+x+1)(x3+1)+x2(x-1)(x2+x+1)+(x2+x+1)
=(x2+x+1)[x.(x-1)(x3+1)+x2(x-1)+1]
=(x2+x+1)(x5+x2-x4-x+x3-x2+1)
=(x2+x+1)(x5-x4+x3-x+1)
\(x^{10}+x^8+1\)
\(=x^{10}-x+x^8-x^2+x^2+x+1\)
\(=x\left(x^9-1\right)+x^2\left(x^6-1\right)+x^2+x+1\)
\(=x\left(x^3-1\right)\left(x^6+x^3+1\right)+x^2\left(x^3+1\right)\left(x^3-1\right)+x^2+x+1\)
\(=\left(x^7+x^4+x\right)\left(x^3-1\right)+\left(x^5+x^2\right)\left(x^3-1\right)+x^2+x+1\)
\(=\left(x^3-1\right)\left(x^7+x^5+x^4+x^2+x\right)+x^2+x+1\)
\(=\left(x^2+x+1\right)\left(x-1\right)\left(x^7+x^5+x^4+x^2+x\right)+x^2+x+1\)
\(=\left(x^2+x+1\right)\left(x^8-x^7+x^6-x^4+x^3-x+1\right)\)
Chúc bạn học tốt.
\(x^{10}+x^5+1\)
\(=x^{10}+x^9+x^8-x^9-x^8-x^7+x^7+x^6+x^5-x^6-x^5-x^4+x^5+x^4+x^3-x^3-x^2-x+x^2+x+1\)
\(=x^8\left(x^2+x+1\right)-x^7\left(x^2+x+1\right)+x^5\left(x^2+x+1\right)-x^4\left(x^2+x+1\right)+x^3\left(x^2+x+1\right)-x\left(x^2+x+1\right)+\left(x^2+x+1\right)\)
\(=\left(x^2+x+1\right)\left(x^8-x^7+x^5-x^4+x^3-x+1\right)\)
= x^10 - x + x^5 - x^2 + x^2 + x + 1
= x ( x^9 - 1 ) + x^2 (x^3 - 1 ) + x^2 + x + 1
= x [ ( x^3 - 1) ( x^6 + x^3 + 1 )] + x^2 ( x - 1 )(x^2 + x + 1 ) + x^2 + x + 1
= x ( x - 1 )(x^2 + x + 1 )(x^6 + x^3 + 1) + x^2 (x-1 )(x^2 + x+ 1 ) + x^2 + x + 1
= (x^2 + x + 1 )[ x(x-1)(x^6 + x^3 + 1 ) + x^2 + 1 )
Nhân ra giúp mình nha
x10 + x5 + 1 = (x10 - x) + (x5 - x2) + (x2 + x + 1) = x.[(x3)3 - 1] + x2.(x3 - 1) + (x2 + x + 1)
= x.(x3 - 1).(x6 + x3 + 1) + x2.(x3 - 1) + (x2 + x + 1)
= (x2 + x + 1). [x.(x -1).(x6 + x3 + 1) + x2 + 1 ]