Question

помогите сократить пожалуйста​

Answer 1

Ответ:

решение смотри на фотографии

Answer 2

$1)\frac{x\sqrt{x} -x\sqrt{y}}{\sqrt{x}-\sqrt{y}}=\frac{x(\sqrt{x}-\sqrt{y})}{\sqrt{x}-\sqrt{y}}=\boxed{x} \\\\2)\frac{\sqrt{70}-\sqrt{30}}{\sqrt{35}-\sqrt{15}} =\frac{\sqrt{7*10}-\sqrt{3*10}}{\sqrt{7*5}-\sqrt{3*5}}=\frac{\sqrt{10}(\sqrt{7}-\sqrt{3})}{\sqrt{5}(\sqrt{7} -\sqrt{3})}=\frac{\sqrt{5}*\sqrt{2}}{\sqrt{5}}=\boxed{\sqrt{2}}\\\\3)\frac{\sqrt{15}-5 }{\sqrt{6}-\sqrt{10}} =\frac{\sqrt{3*5}-\sqrt{5*5} }{\sqrt{2*3}-\sqrt{2*5}}=\frac{\sqrt{5}(\sqrt{3}-\sqrt{5})}{\sqrt{2}(\sqrt{3}-\sqrt{5})}=$

$=\frac{\sqrt{5} }{\sqrt{2} }=\boxed{\frac{\sqrt{10} }{2}}$