Question

Media geometrica a numerelor x=5rad2-7 si y=7+5rad2 este...

Answer 1

Răspuns:

$mg = \sqrt{x \times y} = \sqrt{(5 \sqrt{2} - 7) \times (7 + 5 \sqrt{2} ) } = \sqrt{(5 \sqrt{2} - 7) \times (5 \sqrt{2} + 7) } = \\ = \sqrt{(5 \sqrt{2} ) ^{2} - {7}^{2} } = \sqrt{25 \times 2 - 49} = \sqrt{50 - 49} = \sqrt{1} = 1$