Recapitulare matematică clasa a VIII-a – semestrul I

30 bonus points

3 successes

English

Algebră și geometrie – semestrul I – clasa a VIII-a

Megalix conceived a plan to paralyze all education in the country. They will throw with giant space rocks towards all the schools. It will be a disaster. Victimes, chaos. You have to stop them. Good luck!

If you want to save your points and appear in the Kidibot charts, you must be logged in. Create here an acount or login.

Question 1 of 10

1. Question
1 points
Dacă $a < b$ , atunci $(- \infty, b) \cap [a, b + 1) =$
- $(a, b)$
- $(a, b]$
- $[a, b]$
- $[a, b)$
Correct

Incorrect
Question 2 of 10

2. Question
1 points
ABCDEFG cub, iar I este mijlocul lui [HG]. Atunci d(M, AB)=
- $2 \sqrt{A B}$
- AG
- BC
- $A B \sqrt{2}$
Correct

Incorrect
Question 3 of 10

3. Question
1 points
Dacă $M A ⊥ (A B C)$ , AB=3 cm, BC= 5 cm, MA= 18 cm, atunci d(M, BC)=
- AC
- BC
- AB
- Celelalte răspunsuri sunt greșite
Correct

Incorrect
Question 4 of 10

4. Question
1 points
$\sqrt{n (n + 1) (n + 2) (n + 3) + 1} =$
- $n^{2} + 1$
- $n^{2} + 3 n$
- $\sqrt{{(n + 1)}^{3}}$
- $n^{2} + 3 n + 1$
Correct

Incorrect
Question 5 of 10

5. Question
1 points
$C a r d \{x \in ℤ^{*} | | x | \leq \sqrt{101}\} =$
- 21
- 202
- 100
- 20
Correct

Incorrect
Question 6 of 10

6. Question
1 points
$\sqrt{3 - 2 \sqrt{2}} + \sqrt{6 - 4 \sqrt{2}} = {(\sqrt{2})}^{x} .$ Atunci $\frac{x}{\sqrt{2}} =$
- Alt răspuns
- $\frac{\sqrt{2}}{2}$
- 1
- 2
Correct

Incorrect
Question 7 of 10

7. Question
1 points
Numărul $a = \frac{1}{\sqrt{3} - 2} + \frac{1}{\sqrt{3} + 2}$ aparține intervalului:
- Alt răspuns
- $(π, + \infty)$
- $(- \infty, π)$
- $(- 3, 3)$
Correct

Incorrect
Question 8 of 10

8. Question
1 points
VABCDEF piramidă hexagonală regulată, AB=10 cm, VA=20 cm. Atunci d(A, VD)=
- 10
- $20 \sqrt{3}$
- $10 \sqrt{3}$
- 20
Correct

Incorrect
Question 9 of 10

9. Question
1 points
Piramida regulată are fețele laterale triunghiuri dreptunghice. Alegeți varianta incorectă:
- $m (∠ M A T) = 45^{\circ}$
- $A_{△ A T E} = \frac{M A^{2} \sqrt{3}}{2}$
- $M A ⊥ (A T E)$
- $M A ⊥ (M T E)$
Correct

Incorrect
Question 10 of 10

10. Question
1 points
${(\sqrt{7 - 4 \sqrt{3}} + \sqrt{7 + 4 \sqrt{3}})}^{2} =$
- 14
- $14 + 8 \sqrt{3}$
- 15
- 16
Correct

Incorrect

Examples of questions from "Recapitulare matematică clasa a VIII-a – semestrul I"

Numărul $a = \frac{1}{\sqrt{3} - 2} + \frac{1}{\sqrt{3} + 2}$ aparține intervalului:
Piramida regulată are fețele laterale triunghiuri dreptunghice. Alegeți varianta incorectă:
ABCDEFG cub, iar I este mijlocul lui [HG]. Atunci d(M, AB)=