Matematică – operații elementare cu nr. reprezentate prin litere

20 bonus points

0 successes

English

Acest test verifică dacă elevul știe să adune, scadă, înmulțească, împartă sau să ridice la putere numerele reale reprezentate prin litere.

Chicky Briki 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!

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Question 1 of 10

1. Question
1 points
$(- \frac{15}{2} x^{5}) \div (\frac{3}{8} x^{2}) =$
- $20 x^{3}$
- Niciuna din variante
- $20 x^{7}$
- $- 20 x^{3}$
Correct

Incorrect
Question 2 of 10

2. Question
1 points
${(- \sqrt{5} x^{3})}^{4} + {(- 2 x^{6})}^{2} =$
- $(- \sqrt{5} - 2) x^{12}$
- $29 x^{12}$
- $(\sqrt{5} - 2) x^{19}$
- $28 x^{12}$
Correct

Incorrect
Question 3 of 10

3. Question
1 points
Cubul dublului numărului ${(2 x)}^{2}$ este egal cu:
- $512 x^{6}$
- ${(12 x)}^{2}$
- $256 x^{2}$
- $12 x^{6}$
Correct

Incorrect
Question 4 of 10

4. Question
1 points
Efectuați: ${(\frac{2}{3} x^{2})}^{2} =$
- $\frac{2}{3} x^{4}$
- $\frac{4}{6} x^{4}$
- $\frac{4 x^{4}}{9}$
- $\frac{4}{3} x^{2}$
Correct

Incorrect
Question 5 of 10

5. Question
1 points
$(\frac{1}{4} x^{3}) \times (8 x^{4}) =$
- $12 x^{7}$
- $\frac{8 x^{12}}{4}$
- 12
- $2 x^{7}$
Correct

Incorrect
Question 6 of 10

6. Question
1 points
$4 x - 9 x^{2} + 5 x^{2} - 7 x =$
- $- 11 x - 14 x^{2}$
- $- 4 x^{2} + 3 x$
- $- 4 x^{2} - 3 x$
- $- 11 x + 14 x^{2}$
Correct

Incorrect
Question 7 of 10

7. Question
1 points
$(21 x^{7}) \div (- 3 x^{4}) =$
- $7 x^{3}$
- $- 7 x^{3}$
- $- 18 x^{3}$
- $18 x^{3}$
Correct

Incorrect
Question 8 of 10

8. Question
1 points
$(12 x^{5} + 6 x^{4}) \div (- 6 x^{4}) =$
- $12 x^{5} - 1$
- $2 x - 1$
- $0$
- $- 2 x - 1$
Correct

Incorrect
Question 9 of 10

9. Question
1 points
$3 \sqrt{5} x - 7 \sqrt{2} - 2 \sqrt{2} - 8 \sqrt{5} x =$
- $- 5 \sqrt{5} x - 9 \sqrt{2}$
- Niciuna din variante
- $- 9 \sqrt{2} x - 5 \sqrt{5}$
- $- 11 \sqrt{5} x - 5 \sqrt{2}$
Correct

Incorrect
Question 10 of 10

10. Question
1 points
$7 x^{3} - (3 x) \times (2 x^{2}) =$
- $8 x^{4}$
- $x^{4}$
- $x^{3}$
- $8 x^{3}$
Correct

Incorrect