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a1+a2+a3=45
a1=4*(a1+2r)
a1+a1+r+a1+2r=45
a1=4a1+8r
3a1+3r=45/:3
a1-4a1=8r
a1+r=15
-3a1=8r
a1+r=15
r=-9
więc:
r=-9
a1=24
a2=15
a3=6
SPRAWDZENIE:
a1=4a3
24=4*6
24=24
L=P
a1+a2+a3=45
24+15+6=45
45=45
L=P
Liczę na naj :)