Question

(корень из 2 целых 4/7 минус корень из 7 целых 1/7) разделить на корень 2/63

Answer 1

-6

Объяснение:

$(\sqrt{2\frac{4}{7} } -\sqrt{7\frac{1}{7} } ) :\sqrt{\frac{2}{63} } = (\sqrt{\frac{18}{7} } -\sqrt{\frac{50}{7} } ):\sqrt{\frac{2}{63} } =\\\\ \sqrt{\frac{18}{7} }:\sqrt{\frac{2}{63} }- \sqrt{\frac{50}{7} }:\sqrt{\frac{2}{63} }= \sqrt{\frac{18*63}{7*2} } -\sqrt{\frac{50*63}{7*2} } =\\\\\sqrt{9*9} -\sqrt{25*9} =3*3-5*3 =9-15=-6.$

$(\sqrt{2\frac{4}{7} } -\sqrt{7\frac{1}{7} } ) :\sqrt{\frac{2}{63} } = (\sqrt{\frac{18}{7} } -\sqrt{\frac{50}{7} } ):\sqrt{\frac{2}{63} } = ( \frac{3\sqrt{2} }{\sqrt{7} } -\frac{5\sqrt{2} }{\sqrt{7} } ):\sqrt{\frac{2}{63} }=\\\\-\frac{2\sqrt{2} }{\sqrt{7} } : \frac{\sqrt{2} }{3\sqrt{7} } =-\frac{2\sqrt{2} *3\sqrt{7} }{\sqrt{7}*\sqrt{2} } =-6.$