Odpowiedź :
a1>a2>a3
a1+a2+a3=15
a1+a1+r+a1+2r=15
3a1+3r=15
a1+r=5
a2=5
(5-r)^2+25+(5+r)^2=93
25-10r+rr+25+25+10r+rr=93
2rr=18
rr=9
r=-3 bo r<0
a1=a2-r=8
a2=5
a3=2
a1>a2>a3
a1+a2+a3=15
a1+a1+r+a1+2r=15
3a1+3r=15
a1+r=5
a2=5
(5-r)^2+25+(5+r)^2=93
25-10r+rr+25+25+10r+rr=93
2rr=18
rr=9
r=-3 bo r<0
a1=a2-r=8
a2=5
a3=2