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()
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A
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6
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B
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6
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C
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D
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3
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()
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1
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a
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b
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x
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鐨勬渶绠�鍏垎姣嶆槸
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x
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)(
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x
)
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b2
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a
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b
)
2
(
a
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b
)
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()
A
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6
a
(
a
锛?/p>
b
)
2
(
a
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b
) B
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2(
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锛?/p>
b
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C
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6
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(
a
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b
) D
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6
a
(
a
锛?/p>
b
)