2) Calcule:
a) (5+8i)+(0-i)
b) (-4+2i)+(5-3i)
c) (-1+9i)-(2-8i)
d) (7+3i).(7-3i)
e) (5+6i).(4+8i)
Soluções para a tarefa
Respondido por
2
20+24i+24i+48x(-1)a) (5+8i)+(0-i)=5+7i
5+8i+(-i)
5+8i-i
5+7i
b) (-4+2i)+(5-3i)=1-i
-4+2i+5-3i
1+i
c) (-1+9i)-(2-8i)=-3+17i
-1+9i-2+8i
-(1+2)+(9+8)xi
-3+17i
d) (7+3i).(7-3i)= 58
7²-(3i)²
49-9i²
49-9x(-1)
49-9x1
49+9
x=58
e) (5+6i).(4+8i)=-28+64i
5x4x+5x8i+6ix4+6ix8i
20+24i+24i+48x(-1)
20+40i+24i+48i²
20+40i+24i+48x(-1)
20+40i+24i-(48x1)
20+40i+24i-48
-28+64i
5+8i+(-i)
5+8i-i
5+7i
b) (-4+2i)+(5-3i)=1-i
-4+2i+5-3i
1+i
c) (-1+9i)-(2-8i)=-3+17i
-1+9i-2+8i
-(1+2)+(9+8)xi
-3+17i
d) (7+3i).(7-3i)= 58
7²-(3i)²
49-9i²
49-9x(-1)
49-9x1
49+9
x=58
e) (5+6i).(4+8i)=-28+64i
5x4x+5x8i+6ix4+6ix8i
20+24i+24i+48x(-1)
20+40i+24i+48i²
20+40i+24i+48x(-1)
20+40i+24i-(48x1)
20+40i+24i-48
-28+64i
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