Quiz about Mulțimea numerelor complexe

Question 1

$$Dacă\ z=2-i,\ atunci\ \left|z\right|=$$

Accepted Answer

$$\sqrt{5}$$

Answer

$$\sqrt{3}$$

Answer

$$2$$

Answer

$$1$$

Question 2

$$Conjugata\ lui\ \ z=-4-i\ este:$$

Accepted Answer

$$\overline{z}=-4+i$$

Answer

$$\overline{z}=4-i$$

Answer

$$\overline{z}=-4-i$$

Answer

$$\overline{z}=i-1$$

Question 3

$$Opusul\ numărului\ z=3-6i\ este:$$

Accepted Answer

$$-3+6i$$

Answer

$$3+6i$$

Answer

$$-3-6i$$

Answer

$$3-6i$$

Question 4

$$Fie\ z_1=-2+3i,\ z_2=-2i+4$$ atunci $$z_1+z_2=$$

Accepted Answer

$$2+i$$

Answer

$$7i$$

Answer

$$-2+i$$

Answer

$$2-2i$$

Question 5

$$Dacă\ z_1=4i\ ,\ z_2=6+i$$ atunci
$$z_1-z_2=$$

Accepted Answer

$$-6+3i$$

Answer

$$-6+5i$$

Answer

$$6-3i$$

Answer

$$-3i+6$$

Question 6

$$Dacă\ \ z=2i^3+2i,\ atunci\ z=$$

Accepted Answer

$$0$$

Answer

$$1$$

Answer

$$1+i$$

Answer

$$2i$$

Question 7

$$Soluția\ ecuației\ 4z=-8i+4$$ este:

Accepted Answer

$$1-2i$$

Answer

$$1+i$$

Answer

$$-2i+2$$

Answer

$$-2i$$

Question 8

$$\ Soluția\ ecuație\ z^2+4=0\ în\ Ceste:$$

Accepted Answer

$$-2i;2i$$ -

Answer

$$-2;2$$

Answer

$$-4;4$$

Answer

$$nu\ are\ soluție$$

Mulțimea numerelor complexe