Question

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Answer 1

= $9\sqrt{2}$ { $3\sqrt{10}$ - [ $6\sqrt{10}$ - $2\sqrt{5}$ ( $6\sqrt{2}$ - $4\sqrt{2}$ ) ] }

= $9\sqrt{2}$ [ $3\sqrt{10}$ - ( $6\sqrt{10}$ - $2\sqrt{5}$ x $2\sqrt{2}$ ) ]

= $9\sqrt{2}$ [ $3\sqrt{10}$ - ( $6\sqrt{10}$ - $4\sqrt{10}$) ]

= $9\sqrt{2}$ ( $3\sqrt{10}$ - $2\sqrt{10}$ )

= $9\sqrt{2}$ x $\sqrt10}$

= $9\sqrt{20}$

= $18\sqrt{5}$

Sper că te-am ajutat, coroană? :)