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[主观题]
己知点A(1,-1,2)和B(2,0,-1),则AB=______,BA=______.
己知点A(1,-1,2)和B(2,0,-1),则AB=______,BA=______.
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己知点A(1,-1,2)和B(2,0,-1),则AB=______,BA=______.
己知3点A(2,-2,0)、B(-1,0,1)、C(1,1,2),则:①以|AB|、|AC|为邻边的平行四边形的面积等于______;②三角形ABC的面积等于______.
A.(3,2,-1)与(-4,5,3)
B.(1,-1,2)与(3,5,7)
C.(3,2,2)与(-3,2,4)
D.(2,2,-4)与(-2,0,-1)