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a-dluzszy bok
b-krotszy bok
2a+2b=14,8 /:2
a-2=1,25b
a+b=7,4
a=1,25b+2
(1,25b+2)+b=7,4
a=1,25b+2
1,25b+2+b=7,4
a=1,25b+2
2,25b=5,4/:2,25
a=1,25b+2
b=2,4
a=1,25b+2
b=2,4
a=1,25*2,4+2
b=2,4
a=5