Bai tap 2.2 ([2] sec 5.4)

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2H2<2
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Y Z



2L2 DB=2
2 H2


12L2BI>I 2B>
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> 2H2

T J2DB
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> =2 H2

M
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BR HR

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BF
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> 2B

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K' >I=2
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2

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2


 342

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