将矩阵[img=156x71]18030731cedc0d7.png[/img]化为行最简形应使用的语句是 A: A={{1,-1,5,-1},{1,1,-2,3},{3,-1,8,1}}//MatrixForm RowReduce[A] B: A={{1,-1,5,-1},{1,1,-2,3},{3,-1,8,1}} RowReduce[A] C: A={{1,-1,5,-1},{1,1,-2,3},{3,-1,8,1}} Rowreduce[A] D: A={{1,-1,5,-1},{1,1,-2,3},{3,-1,8,1}} RowSimplify[A]

将向量组[img=167x109]18030731d2da4ae.png[/img]标准正交化应使用的语句是 A: A={{1,1,1,1,1},{3,2,1,1,-3},{1,2,2,0,6},{5,4,3,3,2}}; Orthogonalize[A] B: A={{1,1,1,1,1},{3,2,1,1,-3},{1,2,2,0,6},{5,4,3,3,2}}; RowReduce[A] C: A={1,1,1,1,1},{3,2,1,1,-3},{1,2,2,0,6},{5,4,3,3,2}; Orthogonalize[A] D: A={{1,1,1,1,1},{3,2,1,1,-3},{1,2,2,0,6},{5,4,3,3,2}}; Normalize[A]

求解线性方程组[img=284x71]1803072ce27e8dd.png[/img]的特解 A: A={{2,3,9},{7,5,4},{3,2,1},{1,2,7}};B={6,4,2};LinearSolve[A,B] B: A={{2,3,9},{7,5,4},{3,2,1},{1,2,7}};B={6,4,2};RowReduce[A,B] C: A={{2,3,9},{7,5,4},{3,2,1},{1,2,7}};B={6,4,2};LinearSolve[A,B]+NullSpace[A] D: A={{2,3,9},{7,5,4},{3,2,1},{1,2,7}};B={6,4,2};NullSpace[A]