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若a,b是两个互相垂直的非零向量,则在以下给出的式子“①=0;②+=-;③|+|...
若a,b是两个互相垂直的非零向量,则在以下给出的式子“①
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=0;②
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+
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=
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-
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;③|
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+
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|=|
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-
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|;④
2+
2=(
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+
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)
2;⑤(
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+
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)•(
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-
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)=0”中正确的有( )
A.1个
B.2个
C.3个
D.4个
考点分析:
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B.
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=
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C.
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+
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=
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D.
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=
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B.
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C.
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D.
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,
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