Question

Ученикам 8 класса ВОПРОС

Answer 1

$( \frac{a {}^{2} - 4b {}^{2} }{4ab} ) \times \frac{12ab}{a + 2b} = (a - 2b)(a + 2b) \times \frac{3}{a + 2b} = 3a - 6b = 3(a - 2b)$

Answer 2

$( \frac{a}{4b} - \frac{b}{a} ) \div \frac{a + 2b}{12ab} = \frac{ {a}^{2} - 4 {b}^{2} }{4ab} \times \frac{12ab}{a + 2b} = \frac{(a - 2b)(a + 2b)}{4ab} \times \frac{12ab}{a + 2b} = 3(a - 2b)$