Question

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Answer 1

а)
$frac{2x - 2y}{y} times frac{3 {y}^{2} }{ {x}^{2} - {y}^{2} } = frac{2(x - y)}{y} times frac{3 {y}^{2} }{(x - y)(x + y)} = frac{2 times 3y}{x + y} = frac{6y}{x + y}$
б)
$frac{ac - {a}^{2} }{ {c}^{2} } div frac{c - a}{c} = frac{ac - {a}^{2} }{ {c}^{2} } times frac{c}{c - a} = frac{a(c - a)}{ {c}^{2} } times frac{c}{c - a} = frac{a}{c}$
в)
$frac{ sqrt{8} times sqrt{6} }{ sqrt{24} } = frac{ sqrt{8 times 6} }{ sqrt{24} } = frac{ sqrt{48} }{ sqrt{24} } = sqrt{ frac{48}{24} } = sqrt{2}$

Answer 2

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Готово.
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