求解线性方程组[img=226x71]18030731c3dbe55.png[/img]应使用的语句是 A: A={{2,3,9},{7,5,2},{3,2,1},{1,2,7}}; B={6,4,2};LinearSolve[A,B]+NullSpace[A][[1]]s+NullSpace[A][[2]]t B: A={{2,7,3,1},{3,5,2,2},{9,4,1,7}}; B={6,4,2}; LinearSolve[A,B]+NullSpace[A][[All,1]]s+NullSpace[A][[All,2]]t C: A={{2,7,3,1},{3,5,2,2},{9,4,1,7}}; B={6,4,2}; LinearSolve[A,B]+NullSpace[A][[1]]s+NullSpace[A][[2]]t D: A={{2,7,3,1},{3,5,2,2},{9,4,1,7}}; B={6,4,2}; LinearSolve[A,B]+NullSpace[A].{s,t}

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]