(1,2,-1)的非齐次坐标是
A: (1,2)
B: (-1,-2)
C: (1,2,-1)
D: (1,-2)
A: (1,2)
B: (-1,-2)
C: (1,2,-1)
D: (1,-2)
举一反三
- 点(-1,2)关于原点的对称点坐标是() A: (-1,-2) B: (1,-2) C: (1,2) D: (2,-1)
- 点(1,-2)关于原点的对称点的坐标是() A: (1,2) B: (-1,2) C: (-1,-2) D: (1,-2)
- 设集合A={1,2},则P(A)= ____? A: {{1},{2}} B: {{1},{2},{1,2}} C: {∅,{1},{2},A} D: {∅,{1},{2}}
- 点(1,-1,2)关于y轴的对称点的坐标是( ). A: (1,1,-2) B: (-1,-1,2) C: (1,1,2) D: (-1,-1,-2)
- 已知向量a=(-1,2),b=(1,-2),则2a+b的坐标为( ) A: (1,-1) B: (2,-4) C: (-2,4) D: (-1,2)