Question

ex.4,please,dau coroana

Answer 1

A={x∈N/x,2,6,9 sunt termenii unei proportii}
Cazuri posibile
x/2=6/9⇒9x=12⇒x=12/9⇒x=4/3
x/2=9/6⇒6x=18⇒x=18/6⇒x=3
x/9=2/6⇒6x=18⇒x=3
x/9=6/2⇒2x=54⇒x=27
x/6=2/9⇒9x=12⇒x=12/9⇒x=4/3
x/6=9/2⇒2x=54⇒x=27
Deci A={4/3; 3; 27}