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课时规范练55空间向量及其运算基础巩固练1.设x,y∈R,向量a=(x,1,1),b=(1,y,1),c=(1,-1,1),且a⊥c,b∥c,则|a+b|=()A.❑√5B.3C.2❑√2D.42.... 2025-08-171816155.97 KB5页20
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