Question

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Answer 1

Răspuns:

Explicație pas cu pas:

1. a) $5\sqrt{7}+3\sqrt{7} =8\sqrt{7}$

b) $3\sqrt{7} -5\sqrt{7}=-2\sqrt{7}$

2. a)$4\sqrt{6} *(-2\sqrt{3} )=-8\sqrt{18}=-8*2 \sqrt{3} =-16\sqrt{3}$

b)$4\sqrt{6} :(-2\sqrt{3} )= [4: (-2)] *\sqrt{6:3} = -2\sqrt{2}$

3.  $\frac{6}{\sqrt{2} } = \frac{6\sqrt{2} }{2} =3\sqrt{2}$

$\frac{10}{\sqrt{5} } =\frac{10\sqrt{5} }{5} =2\sqrt{5} \\2\sqrt{5}=\sqrt{2^{2}*5 } =\sqrt{4*5} =\sqrt{20}$

$3\sqrt{2} =\sqrt{3^{2} *2} =\sqrt{18}$

$\sqrt{18} <\sqrt{20}$