Сделайте 3 и 4 номера

Question

Сделайте 3 и 4 номера

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Answer 1

3.
а) 2x - 3y - 11x + 8y = -9x (-5y).
б) 5 (2a + 1) - 3 = 10a + 5 - 3 = 10a + 2.
в) 14x - (x - 1) + (2x + 6) = 14x - x + 1 + 2x + 6 = 15x + 7.

4.
-4 (2,5a - 1,5) + 5,5a - 8 = -10a + 6 + 5,5a = -4,5a + 6.
a = -2. -4,5 × (-2) + 6 = 9 + 6 = 15.