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ex nr 5 dau coroana +5 stele​

Ex Nr 5 Dau Coroana 5 Stele class=

Răspuns :

a) 5√18+3√2-√98=

=5×3√2+3√2-7√2=

=15√2+3√2-7√2=

=18√2-7√2=11√2

b) 7√5+2√125-√20=

=7√5+2×5√5-2√5=

=7√5+10√5-2√5=

=17√5-2√5=15√5

c) 4√7-3√28+√7=

=4√7-3×2√7+√7=

=4√7-6√7+√7=

= -2√7+√7= -√7