Контрольные задания > Решите уравнения: 6. 3x + 15 = 48 7. 40 - 2y = 24 8. 5а - 18 = 57 9. b4 + 7 = 19 10. 60 - c3 = 45 11. 2(x + 8) = 36 12. 3(15 - y) = 30 13. (a + 12)4 = 72 14. (b-7)3 = 11 15. 45(c + 6) = 5
Вопрос:

Решите уравнения: 6. 3x + 15 = 48 7. 40 - 2y = 24 8. 5а - 18 = 57 9. b4 + 7 = 19 10. 60 - c3 = 45 11. 2(x + 8) = 36 12. 3(15 - y) = 30 13. (a + 12)4 = 72 14. (b-7)3 = 11 15. 45(c + 6) = 5

Ответ:

  1. 3x + 15 = 48

    3x = 48 - 15

    3x = 33

    x = 33 : 3

    x = 11

  2. 40 - 2y = 24

    -2y = 24 - 40

    -2y = -16

    y = -16 : (-2)

    y = 8

  3. 5a - 18 = 57

    5a = 57 + 18

    5a = 75

    a = 75 : 5

    a = 15

  4. b4 + 7 = 19

    b4 = 19 - 7

    b4 = 12

    b = 12 : 4

    b = 3

  5. 60 - c3 = 45

    -c3 = 45 - 60

    -c3 = -15

    c3 = 15

    c = 15 : 3

    c = 5

  6. 2(x + 8) = 36

    2x + 16 = 36

    2x = 36 - 16

    2x = 20

    x = 20 : 2

    x = 10

  7. 3(15 - y) = 30

    45 - 3y = 30

    -3y = 30 - 45

    -3y = -15

    y = -15 : (-3)

    y = 5

  8. (a + 12)4 = 72

    4a + 48 = 72

    4a = 72 - 48

    4a = 24

    a = 24 : 4

    a = 6

  9. (b - 7)3 = 11

    3b - 21 = 11

    3b = 11 + 21

    3b = 32

    b = 32 / 3

    b = 10,(6)

  10. 45(c + 6) = 5

    45c + 270 = 5

    45c = 5 - 270

    45c = -265

    c = -265 / 45

    c = -53 / 9

    c = -5,(8)

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