Вопрос:

1. Решите уравнения: а) x : 1,2 = 0,144; б) x · 1,2 = 36; в) 0,013 · y = 1,69; г) 2 · (y + 0,13) = 5,46; д) 3 · (6 − x) = 11,1; е) 0,2 · x + 13,5 = 27; ж) 0,3x + 1,5x = 5,76; з) 0,3x + 0,4x = 15,47; и) 2x + 3,5x = 30,25.

Ответ:

  1. \(x : 1.2 = 0.144\)

    \(x = 0.144 \cdot 1.2 = 0.1728\)

    Ответ: \(x = 0.1728\).

  2. \(x \cdot 1.2 = 36\)

    \(x = 36 : 1.2 = 30\)

    Ответ: \(x = 30\).

  3. \(0.013y = 1.69\)

    \(y = 1.69 : 0.013 = 130\)

    Ответ: \(y = 130\).

  4. \(2(y + 0.13) = 5.46\)

    \(y + 0.13 = 5.46 : 2 = 2.73\)

    \(y = 2.73 - 0.13 = 2.6\)

    Ответ: \(y = 2.6\).

  5. \(3(6 - x) = 11.1\)

    \(6 - x = 11.1 : 3 = 3.7\)

    \(-x = 3.7 - 6 = -2.3\)

    \(x = 2.3\)

    Ответ: \(x = 2.3\).

  6. \(0.2x + 13.5 = 27\)

    \(0.2x = 27 - 13.5 = 13.5\)

    \(x = 13.5 : 0.2 = 67.5\)

    Ответ: \(x = 67.5\).

  7. \(0.3x + 1.5x = 5.76\)

    \(1.8x = 5.76\)

    \(x = 5.76 : 1.8 = 3.2\)

    Ответ: \(x = 3.2\).

  8. \(0.3x + 0.4x = 15.47\)

    \(0.7x = 15.47\)

    \(x = 15.47 : 0.7 = 22.1\)

    Ответ: \(x = 22.1\).

  9. \(2x + 3.5x = 30.25\)

    \(5.5x = 30.25\)

    \(x = 30.25 : 5.5 = 5.5\)

    Ответ: \(x = 5.5\).