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Mathematics, 22.07.2021 09:50 dpazmembreno

Cho x, y,z thõa mãn xy+yz+zx=1 tìm gtnn của biểu thức x^4+y^4+z^4

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Cho x, y,z thõa mãn xy+yz+zx=1 tìm gtnn của biểu thức x^4+y^4+z^4...
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