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

    x + 2x + 3x = ...

    answer choices

    6x

    5x

    5x3

    6x3

  • Question 2
    60 seconds
    Q.

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

    answer choices

    -5a

    -a

    a2

    5a

  • Question 3
    60 seconds
    Q.

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

    answer choices

    5a +3b

    9a + 7b

    5a + 7b

    12ab

  • Question 4
    120 seconds
    Q.

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

    answer choices

    9x2 + 4x +13

    -5x4

    -3 + 4x - 5x2

    x - 5x2

  • Question 5
    180 seconds
    Q.

    3x ∙ (4x – 3) – 2 ∙ (5 – 3x) = ...

    answer choices

    12x2 - 3x - 13

    9x - 13

    12x2 - 15x - 10

    12x2 - 3x - 10

  • Question 6
    180 seconds
    Q.

    (2x – 3) ∙ (5x – 2) = ...

    answer choices

    10x2 - 19x + 6

    10x2 + 6

    10x2 - 6

    10x - 6

    10x + 6

  • Question 7
    120 seconds
    Q.

    (3x – 2)2 = ...

    answer choices

    9x2 - 4

    9x2 - 12x + 4

    9x2 + 4

    9x2 - 12x - 4

  • Question 8
    120 seconds
    Q.

    (5x + 3) ∙ (5x – 3) = ...

    answer choices

    25x2 - 30x + 9

    25x + 9

    25x2 - 9

    25x - 9

  • Question 9
    60 seconds
    Q.

    4x2 + 12x + 9

    descompus în factori:

    answer choices

    (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:

    answer choices

    (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:

    answer choices

    (3x - 7) ⋅ (3x + 3)

    (3x - 27)2

    (3x - 27) ⋅ (3x + 23)

    9x2 -12x - 21

  • Question 12
    120 seconds
    Q.

    49 – 36x2

    descompus în factori:

    answer choices

    13x2

    7 - 6x

    (7 - 6x) ⋅ (7 + 6x)

    (7 - 6x)2

  • Question 13
    300 seconds
    Q.

    25a3b2c4 – 10a4b3c2 + 15a4b5c3

    descompus în factori:

    answer choices

    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:

    answer choices

    (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:

    answer choices

    (x2 - 3) ⋅ (x + 2)

    (2x2 + 1) ⋅ (3x - 2)

    2 ⋅ (x3 - 2x2 + 3)

    (2x2 - 3) ⋅ (x - 2)

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