А) Решение:4.2 * (1 - x) = -8.44.2 - 4.2x = -8.4-4.2x = -8.4 - 4.2-4.2x = -12.6x = -12.6 / -4.2x = 3
Ответ: x = 3
Б) Решение:-0.8(a - 1.5) = 6.8-0.8a + 1.2 = 6.8-0.8a = 6.8 - 1.2-0.8a = 5.6a = 5.6 / -0.8a = -7
Ответ: a = -7
А) Решение:
4.2 * (1 - x) = -8.4
4.2 - 4.2x = -8.4
-4.2x = -8.4 - 4.2
-4.2x = -12.6
x = -12.6 / -4.2
x = 3
Ответ: x = 3
Б) Решение:
-0.8(a - 1.5) = 6.8
-0.8a + 1.2 = 6.8
-0.8a = 6.8 - 1.2
-0.8a = 5.6
a = 5.6 / -0.8
a = -7
Ответ: a = -7