Matematică – operații elementare cu nr. reprezentate prin litere

20 bonus points

34 successes

English

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

For sure you did not expect at this.

Caraplix wants to launch a discount virus. The humans will go crazy and they will spend all the money thay have on stupid things. Dizaster! Only you can save the situation.

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Question 1 of 10

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

Incorrect
Question 2 of 10

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

Incorrect
Question 3 of 10

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

Incorrect
Question 4 of 10

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

Incorrect
Question 5 of 10

5. 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 6 of 10

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

Incorrect
Question 7 of 10

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

Incorrect
Question 8 of 10

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

Incorrect
Question 9 of 10

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

Incorrect
Question 10 of 10

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

Incorrect