gaokao 2017 Q2

gaokao · China · national-II-arts Complex Numbers Arithmetic Complex Division/Multiplication Simplification

$(1+i)(2+i) = $
A. $1-i$
B. $1+3i$
C. $3+i$
D. $3+3i$

$(1+i)(2+i) = $

A. $1-i$

B. $1+3i$

C. $3+i$

D. $3+3i$