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Dau corona
va rog cele 2 ex atasate !


Dau Corona Va Rog Cele 2 Ex Atasate class=

Răspuns :

3.
x=(90-x)-30
x=90-x-30
2x=60 =>x=30

4.
a+b=180
a-b=20
_______ ''+''
2a / =200 =>a=100 =>b=80