S
sockchild


1/. Phan tich da thuc thanh nhan tu:
[TEX]x^4+2009x^2+2008x+2009[/TEX]
2/. Tinh
[TEX]2,5.5^{(n-3)}.10+5n-6.5^{(n-1)} +5^2[/TEX]
lam ro ra tung buoc dum minh lun nha
thanks
[TEX]x^4+2009x^2+2008x+2009[/TEX]
2/. Tinh
[TEX]2,5.5^{(n-3)}.10+5n-6.5^{(n-1)} +5^2[/TEX]
lam ro ra tung buoc dum minh lun nha
thanks
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