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\(x^5+x+1=x^5+x^4-x^4+x^3-x^3+x^2-x^2+x+1\)
\(=\left(x^5+x^4+x^3\right)+\left(x^2+x+1\right)-\left(x^4+x^3+x^2\right)\)
\(=x^3\left(x^2+x+1\right)+\left(x^2+x+1\right)-x^2\left(x^2+x+1\right)\)
\(=\left(x^2+x+1\right)\left(x^3-x^2+1\right)\)
\(x^{10}+x^5+1\)
\(=\left(x^{10}-x^9+x^7-x^6+x^5-x^3+x^2\right)\)
\(+\left(x^9-x^8+x^6-x^5+x^4-x^2+x\right)\)
\(+\left(x^8-x^7+x^5-x^4+x^3-x+1\right)\)
\(=x^2\left(x^8-x^7+x^5-x^4+x^3-x+1\right)\)
\(+x\left(x^8-x^7+x^5-x^4+x^3-x+1\right)\)
\(+\left(x^8-x^7+x^5-x^4+x^3-x+1\right)\)
\(=\left(x^2+x+1\right)\left(x^8-x^7+x^5-x^4+x^3-x+1\right)\)
\(=2x^3+2x^2-9x^2-9x+10x+10\)
\(=2x^2\left(x+1\right)-9x\left(x+1\right)+10\left(x+1\right)\)
\(=\left(x+1\right)\left(2x^2-9x+10\right)\)
\(=\left(x+1\right)\left[\left(2x^2-4x\right)-\left(5x-10\right)\right]\)
\(=\left(x+1\right)\left[2x\left(x-2\right)-5\left(x-2\right)\right]\)
\(=\left(x+1\right)\left(x-2\right)\left(2x-5\right)\)
<=>x4-x+x2 +x+1= x (x-1) (x2+x+1) + (x2+x+1) = (x2+x+1)(x2-x+1)
chắc có lẽ đúng đó
\(b,x^2+6x+5=x^2+x+5x+5=x\left(x+1\right)+5\left(x+1\right)=\left(x+1\right)\left(x+5\right)\)
\(c,x^2-7x+10=x^2-2x-5x+10=x\left(x-2\right)-5\left(x-2\right)=\left(x-2\right)\left(x-5\right)\)
mình chỉ phân tích được đa thức này thôi!
\(x^4+x^2+1\)
\(=x^4+2x^2-x^2+1\)
\(=\left(x^4+2x^2+1\right)-x^2\)
\(=\left(x^2+1\right)^2-x^2\)
\(=\left(x^2+x+1\right)\left(x^2-x+1\right)\)
\(x^4+x^2+1\)
\(=x^4+2x^2+1+x^2-2x^2\)
\(=\left(x^2+1\right)^2-x^2\)
\(=\left(x^2+1-x\right).\left(x^2+1+x\right)\)
Vì phương trình x4+x2+1=0 vô nghiệm nên không thể phân tích thành nhân tử
Ta có : x4 + x2 + 1
= x4 + x2 + x2 + 1 - x2
= (x2 + 1)2 - x2
= (x2 + 1 - x)(x2 + 1 + x)
x4 + x2 + 1
= x4 + 2x2 + 1 - x2
= ( x2 + 1 )2 - x2
= ( x2 - x + 1 )( x2 + x + 1 )
\(x^4+x^3+x^2-1\)
\(=x^3\left(x+1\right)+\left(x+1\right)\left(x-1\right)\)
\(=\left(x+1\right)\left(x^3+\left(x-1\right)\right)\)
Ủng hộ nha ^ _ ^
\(x^4+x^3+x^2-1\)
\(=x^2\left(x^2-1\right)+x^2-1\)
\(=\left(x^2+1\right)\left(x^2-1\right)\)
\(x^{10}+x^2+1\)
\(=x^{10}-x^8+x^4+x^8-x^6+x^2+x^6-x^4+1\)
\(=x^4\left(x^6-x^4+1\right)+x^2\left(x^6-x^4+1\right)+\left(x^6-x^4+1\right)\)
\(=\left(x^6-x^4+1\right)\left(x^4+x^2+1\right)\)
\(=\left(x^6-x^4+1\right)\left[x^4+2x^2+1-x^2\right]\)
\(=\left(x^6-x^4+1\right)\left[\left(x^2+1\right)^2-x^2\right]\)
\(=\left(x^6-x^4+1\right)\left(x^2+1+x\right)\left(x^2+1-x\right)\)