Recapitulare matematică clasa a VIII-a – semestrul I

30 bonus points

29 successes

English

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

Ufo sings you a hypnotic song. Your mind is foggy. Can you show us how strong you are?

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
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 2 of 10

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

Incorrect
Question 3 of 10

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

Incorrect
Question 4 of 10

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

Incorrect
Question 5 of 10

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

Incorrect
Question 6 of 10

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

Incorrect
Question 7 of 10

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

Incorrect
Question 8 of 10

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

Incorrect
Question 9 of 10

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

Incorrect
Question 10 of 10

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

Incorrect

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

${(\sqrt{7 - 4 \sqrt{3}} + \sqrt{7 + 4 \sqrt{3}})}^{2} =$
Piramida regulată are fețele laterale triunghiuri dreptunghice. Alegeți varianta incorectă:
ABCDEFG cub, iar I este mijlocul lui [HG]. Atunci d(M, AB)=