Răspunsuri

2014-06-07T12:57:17+03:00
F1=5
f2=7
f3=9
f4=11
f5=13
f6=15
f7=17
f8=18
f9=21
f10=23

5+7+9+11+13+15+17+19+21+23=140

2014-06-07T13:02:16+03:00
F(1)=2*1+3=2+3=5
f(2)=2*2+3=4+3=7
f(3)=2*3+3=6+3=9
..........................
f(10)=2*10+3=20+3=23

S=(5+23)*10/2=28*5=140