10th
grade

Mathematics

61%

accuracy

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Cristina Măgirescu

3 years

Mathematics

10th

grade

Numere complexe: operații

Cristina Măgirescu

15
plays

16 questions

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1. Multiple Choice
2 minutes
1 pt
dacă $z=5+2i$ atunci $z\cdot\overline{z}=$
$\sqrt{29}$
$21$
$5-2i$
29
2. Multiple Choice
1 minute
1 pt
Calculați $\left(5+3i\right)^2$
34
$25+9i$
$2+6i$
$16+30i$
3. Multiple Choice
45 seconds
1 pt
Aflați: $\left|4+3i\right|$
25
5
17
$\sqrt{17}$
7
4. Multiple Choice
45 seconds
1 pt
$i^{2020}$
$i$
$-i$
1
$-1$
- 2020
5. Multiple Choice
3 minutes
1 pt
Sa se calculeze partea imaginara a numarului complex $z=\frac{1-i}{1+i}$
$Im\ z=1$
$Im\ z=0$
$Im\ z=i$
$Im\ z=-i$
$Im\ z=-1$
6. Multiple Choice
20 seconds
1 pt
Partea reală a numărului 7i+3 este
7
-3
3
-7
7. Fill in the Blank
30 seconds
1 pt
Partea imaginară a lui z = 2 + 3i este:
8. Fill in the Blank
20 seconds
1 pt
Partea reală a numărului z = 7i este:
9. Fill in the Blank
45 seconds
1 pt
Dacă $z=5+2i$ atunci $\overline{z}=$
10. Fill in the Blank
45 seconds
1 pt
$i^3=$
11. Fill in the Blank
2 minutes
1 pt
Fie $z_1=2+3i$ și $z_2=7-3i$ . Calculați $z_1-z_2$
12. Fill in the Blank
3 minutes
1 pt
Calculați $\frac{25}{4+3i}+\frac{25}{4-3i}$
13. Multiple Choice
30 seconds
1 pt
Dacă
$z=2-3i$
Aflați Re (z), respectiv Im (z)
Re (z) = 2, Im (z) = 3
Re (z) = 2, Im (z) = -3
Re (z) = -2, Im (z) = 3
14. Multiple Choice
45 seconds
1 pt
Dacă $z_1=-2-3i\ \ \ si\ \ z_2=1+4i,$ atunci $z_1+z_2$ este:
-2-i
-1-i
-1+i
15. Multiple Choice
30 seconds
1 pt
$\left(3i\right)^2$
9
-9
3
-3
16. Multiple Choice
30 seconds
1 pt
$\left(-5i\right)^2$
5
25
-5
-25
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