[Toán 8]Phân tích đt nhân tử

N

nhimcon_cute

[TEX]= n(n^4+10n^3+35n^2+50n+24)[/TEX]
[TEX]=n<(n^4+3n^3)+(7n^3+21n^2)+14n^2+42n)+(8n+24)>[/TEX]
[TEX]=n<n^3(n+3)+7n^2(n+3)+14n(n+3)+8(n+3)[/TEX]
[TEX]=n(n^3+7n^2+14n+8)(n+3)[/TEX]
[TEX]=n<(n^3+4n^2)+(3n^2+12n)+(2n+8)>(n+3)[/TEX]
[TEX]=n<n^2(n+4)+3n(n+4)+2(n+4)>(n+3)[/TEX]
[TEX]=n(n+4)(n^2+3n+2)(n+3)[/TEX]

~~> Chú ý latex
 
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V

vitconcatinh_foreverloveyou

= n(n^4+10n^3+35n^2+50n+24)
=n<(n^4+3n^3)+(7n^3+21n^2)+(14n^2+42n)+(8n+24)>
=n<n^3(n+3)+7n^2(n+3)+14n(n+3)+8(n+3)
=n(n^3+7n^2+14n+8)(n+3)
=n<(n^3+4n^2)+(3n^2+12n)+(2n+8)>(n+3)
=n<n^2(n+4)+3n(n+4)+2(n+4)>(n+3)
=n(n+4)(n^2+3n+2)(n+3)

cái này vẫn pt típ đc mà
[TEX]n(n+4)(n^2+3n+2)(n+3)= n(n+1)(n+2)(n+3)(n+4)[/TEX]
 
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