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23,0 điểm
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= − − +y x x
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4
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23,0 điểm
< 4
4 = − + +y x x
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25 !"#
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23,0 điểm
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23,0 điểm
< 4
4 4= − + −y x x
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4 4− + − =x x m
23,0 điểm
= −y x x
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23,0 điểm
4
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Câu I.(3 điểm)
4= − + −y x x
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Câu I ( 3,0 điểm )
4
2= − + −xy x
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4
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Câu I ( 3,0 điểm )
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4 6− − =x x m