DIGITALIADA VIII. Calcule cu numere reale prin litere
a year ago
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• Question 1
60 seconds
Q.

x + 2x + 3x = ...

6x

5x

5x3

6x3

• Question 2
60 seconds
Q.

3a - 6a + 2a = ...

-5a

-a

a2

5a

• Question 3
60 seconds
Q.

7a + 2b -2a + 5b = ...

5a +3b

9a + 7b

5a + 7b

12ab

• Question 4
120 seconds
Q.

x + 5 + 3x + 2x2 - 8 - 7x2 = ...

9x2 + 4x +13

-5x4

-3 + 4x - 5x2

x - 5x2

• Question 5
180 seconds
Q.

3x ∙ (4x – 3) – 2 ∙ (5 – 3x) = ...

12x2 - 3x - 13

9x - 13

12x2 - 15x - 10

12x2 - 3x - 10

• Question 6
180 seconds
Q.

(2x – 3) ∙ (5x – 2) = ...

10x2 - 19x + 6

10x2 + 6

10x2 - 6

10x - 6

10x + 6

• Question 7
120 seconds
Q.

(3x – 2)2 = ...

9x2 - 4

9x2 - 12x + 4

9x2 + 4

9x2 - 12x - 4

• Question 8
120 seconds
Q.

(5x + 3) ∙ (5x – 3) = ...

25x2 - 30x + 9

25x + 9

25x2 - 9

25x - 9

• Question 9
60 seconds
Q.

4x2 + 12x + 9

descompus în factori:

(4x+9)2

(2x-3)2

(2x+3)2

(2x+3) ∙ (2x-3)

• Question 10
180 seconds
Q.

4x∙(3x – 2) – 5∙(3x – 2)

descompus în factori:

(3x - 2) ∙ 4x

2x2 - 23x + 10

(3x - 2) ∙ (4x + 5)

(3x - 2) ∙ (4x - 5)

(3x - 2) ∙ 5

• Question 11
180 seconds
Q.

(3x – 2)2 – 25

descompus în factori:

(3x - 7) ⋅ (3x + 3)

(3x - 27)2

(3x - 27) ⋅ (3x + 23)

9x2 -12x - 21

• Question 12
120 seconds
Q.

49 – 36x2

descompus în factori:

13x2

7 - 6x

(7 - 6x) ⋅ (7 + 6x)

(7 - 6x)2

• Question 13
300 seconds
Q.

25a3b2c4 – 10a4b3c2 + 15a4b5c3

descompus în factori:

a3b2c2 ⋅ (25a2c2 - 10a2b + 15a2b3c)

10a4b5c4 ⋅ (15ab3 - b2c3 + 5c)

30a3b4c5

5a3b2c2 ⋅ (5c2 - 2ab + 3ab3c)

• Question 14
300 seconds
Q.

(5x – 2)2 – (3x + 5)2

descompus în factori:

(3x + 3)2

(2x - 7) ⋅ (8x + 3)

(5x - 2) ⋅ (3x + 5)

(3x - 2) ⋅ (2x + 5)

• Question 15
300 seconds
Q.

2x3 – 4x2 – 3x + 6

descompus în factori: