问题补充:
单选题若非零向量a,b满足|a|=|b|,(2a+b)·b=0,则a与b的夹角为A.30°B.60°C.120°D.150°
答案:
C
时间:2024-01-13 08:19:34
单选题若非零向量a,b满足|a|=|b|,(2a+b)·b=0,则a与b的夹角为A.30°B.60°C.120°D.150°
C
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单选题若a b a+b为非零向量 且a+b平分a与b的夹角 则A.a=bB.a
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单选题若非零向量a b满足|a+b|=|b| 则A.|2a|>|2a+b|B.|
2020-06-17