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第45讲空间向量及其运算和空间位置关系1.C[解析]因为A(1,5,-2),B(2,4,2),C(a,3,b+2),所以⃗AB=(1,-1,4),⃗AC=(a-1,-2,b+4),又A,B,C三点共线... 2026-05-189365.83 KB8页277
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