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f:R→R
f₍x₎=3x-2
f₍1₎+f₍2₎+f₍3₎→f₍5₎=?


Răspuns :

calculam f (1)=3*1-2=1
f (2)=2*3-2=4
f (3)=3*3-2=7
f (5)=3*5-2=13
1+4+7+13=25