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a fost răspuns

[tex]( \sqrt{5} - \sqrt{7} ) ( \sqrt{5} + \sqrt{7} ) - \frac{(2 \sqrt{5} -5 \sqrt{2}) }{ \sqrt{5} - \sqrt{2} } *10[/tex]

Răspuns :

MFM
5-7-(2√5-5√2)(√5+√2)/(5-2) *√10=
-2-(10-5√10+2√10-10)/3*√10=
-2+3√10/3*√10=√10.√10-2=10-2=8

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