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va rog 3,4,5,6 dau coroana

Va Rog 3456 Dau Coroana class=

Răspuns :

3. A\B = {1, 2}
4. a= 11, [tex] \frac{a+b}{2} =12.5[/tex] => a+b=25=>b=14
5. 5-3x=2=>3x=3=>x=1
6. latime=3/5 * 15dm=9dm=> perimetrul = 2*(latime+lungime)=2*(15+9)=2*24=48dm=4.8m