Question

ПОМОГИТЕ СРОЧНО
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Answer 1

$frac{11}{5- sqrt{14} } - frac{2}{4- sqrt{14} } = frac{11(5+ sqrt{14})}{(5- sqrt{14})(5+ sqrt{14}) } - frac{2(4+ sqrt{14})}{(4- sqrt{14})(4+ sqrt{14}) } = \ \ = frac{11(5+ sqrt{14})}{25-14 } - frac{2(4+ sqrt{14})}{16-14 }=frac{11(5+ sqrt{14})}{11 } - frac{2(4+ sqrt{14})}{2 }= \ \ =5+ sqrt{14}-(4+ sqrt{14} )= 5+ sqrt{14}-4- sqrt{14} = 5-4=1$