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4x(√5-2√2)+3(7√5-4√2)-7(√2-3√5)

Răspuns :

4x(√5-2√2)+3(7√5-4√2)-7(√2-3√5)=

4√5- 8√2+ 21√5- 12√2- 7√2+ 21√5 =

46
√5- 27√2
desfacem parantezele
=4x√5-4x2√2 +3x7√5-3x4√2-7√2+7x3√5
=4√5-8√2+21√5-12√2-7√2+21√5 ( grupam termeni asemenea)
=4√5+21√5+21√5 -8√2-12√2-7√2
=46√2-27√2