Question

scrieți următoarele numere, introducând factorii sub radicali:
a)
$- 3 \sqrt{2}$
b)
$- 2 \times \sqrt{15}$
c)
$\frac{ - 5}{7} \sqrt{ \frac{7}{5} }$
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Answer 1

Răspuns:

a)

$- 3 \sqrt{2} = - \sqrt{ {3}^{2} \times 2} = - \sqrt{18}$

b)

$- 2 \sqrt{15} = - \sqrt{ {2}^{2} \times 15} = - \sqrt{60}$

c)

$- \frac{5}{7} \sqrt{ \frac{7}{5} } = - \sqrt{ \frac{25}{49} \times \frac{7}{5} } = - \sqrt{ \frac{5}{7} }$

Answer 2

Răspuns:

a) -3√2= -√(3)²•2= -√9•2= -√18

b) -2√15= -√(2)²•15= -√4•15= -√60

c) -5/7•√7/5= -√(5/7)²•7/5= -√25/49•7/5= -√5/7