а) B1C+AB+BB1+B1A
б) DC-BB1
решение желательно с фото
vector{[red]A[/red][b]B[/b]}+vector{[b]B[/b][red]C[/red]}=vector{[red]AC[/red]}
a)
vector{AB}+vector{BB_(1)}=vector{AB_(1)}
[blue]vector{AB}+vector{BB_(1)}+vector{B_(1)A}[/blue]=vector{AB_(1)}+vector{B_(1)A}=vector{0}
vector{B_(1)C}+vector{AB}+vector{BB_(1)}+vector{B_(1)A}=
=vector{B_(1)C}+([blue]vector{AB}+vector{BB_(1)}+vector{B_(1)A}[/blue])=
= vector{B_(1)C}+vector{0}=vector{B_(1)C}
О т в е т. vector{B_(1)C}
б)
vector{DC}=vector{A_(1)B_(1)}
vector{BB_(1)}=-vector{B_(1)B}
vector{DC}-vector{BB_(1)}=vector{A_(1)B_(1)}+vector{B_(1)B}=
=vector{A_(1)B}
О т в е т. vector{A_(1)B}