设，且与互相垂直，则k=_________/ananas/latex/p/1010909/ananas/latex/p/237638/ananas/latex/p/533557
设，且与互相垂直，则k=_________/ananas/latex/p/1010909/ananas/latex/p/237638/ananas/latex/p/533557
1
设，且与互相垂直，则k=_________/ananas/latex/p/1010909/ananas/latex/p/237638/ananas/latex/p/533557