0 XÉT KHAI TRIỂN 1X10C100 C X C X

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1

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x

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C

10

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C x C x ... C x

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10

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10

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^{10 10}

10

x

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1

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x

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x C

^{2 0}

10

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C x C x ... C x

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10

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10

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^{10 12}

10

^{S= 2 1+2}

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