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复习课第1课时空间向量与立体几何课后训练巩固提升1.已知A(2,-4,-1),B(-1,5,1),C(3,-4,1),D(0,0,0),令a=⃗CA,b=⃗CB,则a+b为()A.(5,-9,2)B.... 2025-03-1220780.89 KB5页49
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