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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)
$\frac{ \sqrt{8} \times \sqrt{6} }{ \sqrt{24} } = \frac{ \sqrt{8 \times 6} }{ \sqrt{24} } = \frac{ \sqrt{48} }{ \sqrt{24} } = \sqrt{ \frac{48}{24} } = \sqrt{2}$