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1.若 為平面上三個非零向量,則下列哪些選項是正確的?(A) 不可能相等(B) 必與 垂直(C)(D)若 上的正射影與 上的正射影與相等,則 平行(E)將 的線性組合為 ,其中x,y為實數,若「所決定
問題詳情
1.若
為平面上三個非零向量,則下列哪些選項是正確的?
(A)
不可能相等
(B)
必與
垂直
(C)
(D)若
上的正射影與
上的正射影與相等,則
平行
(E)將
的線性組合為
,其中x,y為實數,若「
所決定的平行四邊形面積」是「
所決定的平行四邊形面積」的2倍,則| y |=2
參考答案
答案:B,E
難度:
計算中
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