\(x^5+x^4+1\)

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29 tháng 7 2015

x5+x4+1=x5+x4+x3+x2+x+1-x3-x2-x

            =x3.(x2+x+1)+(x2+x+1)-x.(x2+x+1)

            =(x2+x+1)(x3-x+1)

9 tháng 11 2016

x5 + x4 + 1 = x5 - x3 - x2 - x4 + x2 + x + x3 - x - 1

= x2 ( x3 - x - 1 ) - x ( x3 - x - 1 ) + 1 ( x3 - x - 1 )

= ( x3 - x - 1 ) ( x2 - x + 1 )

 

9 tháng 11 2016

x5+x4+1

= x5+x2-x2+x4-x+x+1

=x2(x3-1) + (x3+1) +x2+x+1

= x2(x-1)(x2+x+1)+x(x-1)( x2+x+1) +x2+x+1

=( x2 + x+1)( x3-x2+x2-x+1)

=(x2 + x+1)( x3-x+1)

\(x^8+x^4+1\)

\(=x^8+x^7+x^6-x^7-x^6-x^5+x^5+x^4+x^3-x^3-x^2-x+x^2+x+1\)

\(=\left(x^8+x^7+x^6\right)-\left(x^7+x^6+x^5\right)+\left(x^5+x^4+x^3\right)-\left(x^3+x^2+x\right)+\left(x^2+x+1\right)\)

\(=x^6\left(x^2+x+1\right)-x^5\left(x^2+x+1\right)+x^3\left(x^2+x+1\right)-x\left(x^2+x+1\right)+\left(x^2+x+1\right)\)

\(=\left(x^2+x+1\right)\left(x^6-x^5+x^3-x+1\right)\)

\(x^5-x^4-1\)

\(=x^5-x^4+x^3-x^3+x^2-x-x^2+x-1\)

\(=\left(x^5-x^4+x^3\right)-\left(x^3-x^2+x\right)-\left(x^2-x+1\right)\)

\(=x^3\left(x^2-x+1\right)-x\left(x^2-x+1\right)-\left(x^2-x+1\right)\)

\(=\left(x^2-x+1\right)\left(x^3-x-1\right)\)

20 tháng 7 2019

\(A=x^5+x^4+1\)

\(A=x^5+x^4+x^3+1-x^3\)

\(A=x^3.\left(x^2+x+1\right)+\left(1-x\right).\left(x^2+x+1\right)\)

\(A=\left(x^3-x+1\right).\left(x^2+x+1\right)\)

23 tháng 9 2019

\(x^5+x^4+2\)

\(=x^5+x^4+x^2-x^2+1+1\)

\(=\left(x^5-x^2\right)+\left(x^4+x^2+1\right)\)

\(=\left(x^5-x^2\right)+\left(x^4+2x^2-x^2+1\right)+1\)

\(=x^2\left(x^3-1\right)+\left(x^4+2x^2-x^2+1\right)+1\)

\(=x^2\left(x-1\right)\left(x^2+x+1\right)+\left(\left(x^2+1\right)^2-x^2\right)+1\)

\(=x^2\left(x-1\right)\left(x^2+x+1\right)+\left(x^2+1+x\right)\cdot\left(x^2+1-x\right)+1\)

\(=\left(x^3-x^2\right)\left(x^2+x+1\right)+\left(x^2+1+x\right)\cdot\left(x^2+1-x\right)+1\)

\(=\left(x^2+x+1\right)\left(x^3-x^2+x^2+1-x\right)+1\)

\(=\left(x^2+x+1\right)\left(x^3+1-x\right)+1\)

24 tháng 9 2016

\(x^5+x+1=x^5+x^4-x^4+x^3-x^3+x^2-x^2+x+1\)
                     \(=\left(x^5+x^4+x^3\right)+\left(x^2+x+1\right)-\left(x^4+x^3+x^2\right)\)
                     \(=x^3\left(x^2+x+1\right)+\left(x^2+x+1\right)-x^2\left(x^2+x+1\right)\)
                     \(=\left(x^2+x+1\right)\left(x^3-x^2+1\right)\)
                

3 tháng 6 2019

\(x^{10}+x^5+1\)

\(=\left(x^{10}-x^9+x^7-x^6+x^5-x^3+x^2\right)\)

\(+\left(x^9-x^8+x^6-x^5+x^4-x^2+x\right)\)

\(+\left(x^8-x^7+x^5-x^4+x^3-x+1\right)\)

\(=x^2\left(x^8-x^7+x^5-x^4+x^3-x+1\right)\)

\(+x\left(x^8-x^7+x^5-x^4+x^3-x+1\right)\)

\(+\left(x^8-x^7+x^5-x^4+x^3-x+1\right)\)

\(=\left(x^2+x+1\right)\left(x^8-x^7+x^5-x^4+x^3-x+1\right)\)

1 tháng 8 2018

\(x^5+x-1\)

\(=\left(x^5+x^4-x^2\right)-\left(x^4+x^3-x\right)+\left(x^3+x^2-x\right)\)

\(=x^2\left(x^3+x^2-1\right)-x\left(x^3+x^2-1\right)+\left(x^3+x^2-1\right)\)

\(=\left(x^2-x+1\right)\left(x^3+x^2-1\right)\)

7 tháng 4 2019

Đa thức có dạng  \(x^{3a+1}+x^{3b+2}+1\)  thì đưa về dạng  \(\left(x^2+x+1\right)\cdot P\left(x\right)\) bạn nhé!

Bài làm:

\(x^5+x+1\)

\(=\left(x^5-x^2\right)+\left(x^2+x+1\right)\)

\(=x^2\left(x^3-1^3\right)+\left(x^2+x+1\right)\)

\(=x^2\left(x-1\right)\left(x^2+x+1\right)+\left(x^2+x+1\right)\)

\(=\left(x^2+x+1\right)\left(x^3-x^2+1\right)\)

\(x^5+x+1=x^5-x^2+x^2+x+1\)

\(=x^2\left(x^3-1\right)+x^2+x+1\)

\(=x^2\left(x-1\right)\left(x^2+x+1\right)+\left(x^2+x+1\right)\)

\(=\left(x^2+x+1\right)\left(x^2\left(x-1\right)+1\right)\)

2 tháng 11 2016

<=>x4-x+x+x+1= x (x-1) (x2+x+1)  +  (x2+x+1)  =   (x2+x+1)(x2-x+1)

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