Question

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Answer 1

$\frac{13\sqrt{d}}{\sqrt{ab}+\sqrt{bc}}:\frac{30\sqrt{d}}{a-c}=\frac{13\sqrt{d}}{\sqrt{b}(\sqrt{a}+\sqrt{c})} *\frac{(\sqrt{a})^{2}-(\sqrt{c})^{2}}{30\sqrt{d}}=\frac{13\sqrt{d}}{\sqrt{b}(\sqrt{a}+\sqrt{c})}*\frac{(\sqrt{a}+\sqrt{c})(\sqrt{a}-\sqrt{c})}{30\sqrt{d}}=\\\\=\frac{13(\sqrt{a}-\sqrt{c})}{30\sqrt{b}}$