1) =
(1,5)
= (4,1)
·
=
4·1+1·5 = 9
|| =
@
4,12
2) =
(4,1)
= (1,5)
·
=
1·4+5·1 = 9
|| =
@
5,1
3) =
(-3,1)
= (2,2)
·
=
2(-3)+2·1 = -4
|| =
@
2,83
4) =
(2,2)
= (-3,1)
·
=
(-3)·2+1·2 = -4
|| =
@
3,16
5) =
(1,2)
= (4,-2)
·
=
4·1+(-2)·2 = 0
|| =
@
4,47
6) =
(2,1)
= (4,2)
·
=
4·2+2·1 = 10
|| =
@
4,47
7) =
(-4,-2)
= (2,1)
·
=
2(-4)+1(-2) = -10
|| =
@
2,24