kiem tra chuong IV dai so 8 co ma tran

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6"# 3 7 2  ? L E F
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
7 2 ?− >x
7 ? 2x

⇔ > +
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⇔
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x >
4.E?
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x >
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 4.7?
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32
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32≥ −x
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32≥ −x

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
3 2 4 1
4 3 3
x x x− − +
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4x
≥
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7 4 7x x
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2
x x
x
x

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⇔ =
⇔ =
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
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7 7x x− = −
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7 7 Ex x
− + =
7 E 7x x⇔ − + = −
?x
⇔ =
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(TM K)Đ
0
4
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0-13