(4ĐIỂM) A. Z1+Z2=2+IZ1− Z2=4−5IZ1.Z2=3+11IZ1Z2=−9−7I10 =−910 − 710...

Câu2(4điểm) a. z

1

+z

2

=2+iz

1

− z

2

=45iz

1

.z

2

=3+11iz

1

z

2

=9−7i10 =910 710ib. 3z

1

+2z

2

=7

|

3z

1

+2z

2

|

=7z= 4z

2

−2z

1

=−10+16iz=−10−16i