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Вот эти 2 задания

Answer 1

В1.

$frac{sqrt{6}-2-sqrt{10}  }{sqrt{3}-sqrt{2}-sqrt{5} } = frac{(sqrt{6} -2-sqrt{10})*(sqrt{3}-sqrt{2} + sqrt{5} ) }{-2sqrt{6} } = frac{sqrt{18}-sqrt{12} +sqrt{30}  -2sqrt{3} + 2sqrt{2} - 2sqrt{5} -sqrt{30}+sqrt{20} -sqrt{50}  }{-2sqrt{6} } =$ $frac{3sqrt{2}-2sqrt{3} -2sqrt{3} + 2sqrt{2} - 2sqrt{5}+2sqrt{5}   -sqrt{50} }{-2sqrt{6} } = frac{3sqrt{2}-2sqrt{3} -2sqrt{3} + 2sqrt{2}    -5sqrt{2} }{-2sqrt{6} } = frac{0-4sqrt{3} }{-2sqrt{6} } = frac{-4sqrt{3} }{-2sqrt{6} } = frac{2}{sqrt{2} } = sqrt{2}$

С1.

$frac{sqrt{y} }{sqrt{x} -2sqrt{y} } = frac{sqrt{y}* (sqrt{x} + 2sqrt{y} ) }{(sqrt{x}-2sqrt{y} ) * (sqrt{x} + 2sqrt{y} ) } =frac{sqrt{xy} +2y}{x-4y}$