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2 (radical20-radical6)-5 (radical5+3radical6

Răspuns :

2(√20-√6)-5(√5-3√6)=2√20-2√6-5√5+5x3√6=2x2√5-2√6-5√5+15√6=
=4√5-2√6-5√5+15√6= -√5+13√6