JIS
Answered

Nombres complexes svp ! : additon et multiplication
a) (2-3i)+(1+2i) b) ( 2-5i) +(3-i) c) ( 2+i)-(-3-i)
d) (1+i)(2+i) e) (2+3i)(4-i) f) (1+i)²
Division 
a) 2/1-i b) 2+i/3-2i c) i/2+i

Sagot :

DROOPETTE
a) (2-3i)+(1+2i)
=2-3i+1+2i
=3-i

b) ( 2-5i) +(3-i)
=2-5i+3-i
=5-6i

c) ( 2+i)-(-3-i)
=2+i+3+i
=5+2i

d) (1+i)(2+i)
=2+i+2i+i²
=i²+3i+2

e) (2+3i)(4-i)
=8-2i+12i-3i²
=-3i²+10i+8

f) (1+i)²
=1+2i+i²

Division 
a) 2/1-i
=2-i
 
b) 2+i/3-2i 
=6+i/3-6i/3
=6-5i/3

c) i/2+i
i/2+2i/2
=3i/2