Question

7 клас 7. Найдите значение выражений: 8a + 3 1/6 * b 1) при a = 1 1/2 b = 3/19 2) 3, 6x - 8, 2y при x = 0.5 y = - 1, 5 3) 12, 5a ^ 2 + 3, 6b при a = 1, 2 b = 0, 8 4) 15x ^ 2 - 4, 2y ^ 2 при x = 0.8 y = 5/6 ILATIONAL АПОНШАЛ

Answer 1

Ответ:

Пошаговое объяснение:

Answer 2

1) При a = 1 1/2 и b = 3/19:

8a + 3 1/6 * b + 1 = 8 * (1 1/2) + 3 1/6 * (3/19) + 1 = 8 * 3/2 + 19/6 * 3/19 + 1 = 24/2 + 57/38 + 1 = 12 + 57/38 + 1 = 13 + 57/38 = 14 19/38

2) При x = 0.5 и y = -1,5:

3 + 6x - 8 + 2y = 3 + 6 * 0.5 - 8 + 2 * (-1.5) = 3 + 3 - 8 - 3 = -5

3) При a = 1 и b = 0.8:

12 + 5a^2 + 3 * 6b = 12 + 5 * 1^2 + 3 * 6 * 0.8 = 12 + 5 + 14.4 = 31.4

4) При x = 0.8 и y = 5/6:

15x^2 - 4 + 2y^2 = 15 * 0.8^2 - 4 + 2 * (5/6)^2 = 15 * 0.64 - 4 + 2 * (25/36) = 9.6 - 4 + 2 * (25/36) = 5.6 + 2 * (25/36) = 5.6 + 50/36 = 5.6 + 25/18 = (5.6 * 18 + 25) / 18 = (100.8 + 25) / 18 = 125.8 / 18 = 6.9888