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cloudymay


bai 1:[TEX](x^3 + 1) + ( x^2 + 1) + 3x \sqrt{x+1} > 0[/TEX]
bai 2:[TEX]\sqrt {x^4 - 2x^2 + 1} > 1 - x[/TEX]
chu yeu giup t bai 1 ban.nhe' con bai 2 thi t lam roi nhung t xet lam truong hop wa'. hyhy,cac ban giai ra de t biet t thua`cai' j nhe. hyhy,thanks ca nha
bai 2:[TEX]\sqrt {x^4 - 2x^2 + 1} > 1 - x[/TEX]
chu yeu giup t bai 1 ban.nhe' con bai 2 thi t lam roi nhung t xet lam truong hop wa'. hyhy,cac ban giai ra de t biet t thua`cai' j nhe. hyhy,thanks ca nha