Recapitulare matematică clasa a VIII-a – semestrul I

30 bonus points

27 successes

English

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

What a disaster!

Chicky Briki wants to lead a Crocobets team to attack your school. Take him down!

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

Incorrect
Question 2 of 10

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

Incorrect
Question 3 of 10

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

Incorrect
Question 4 of 10

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

Incorrect
Question 5 of 10

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

Incorrect
Question 6 of 10

6. 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
- BC
- AC
- AB
Correct

Incorrect
Question 7 of 10

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

Incorrect
Question 8 of 10

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

Incorrect
Question 9 of 10

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

Incorrect
Question 10 of 10

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

Incorrect

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

Dacă $a < b$ , atunci $(- \infty, b) \cap [a, b + 1) =$
${(\sqrt{7 - 4 \sqrt{3}} + \sqrt{7 + 4 \sqrt{3}})}^{2} =$
Piramida regulată are fețele laterale triunghiuri dreptunghice. Alegeți varianta incorectă: