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b-drugi bok działki
2a+2b=192m/:2
a+b=96m
a/b=3/5
a+b=96m
5a=3b/:5
a+b=96m
a=3/5b
3/5b+b=96m
a=3/5b
1 3/5b=96m/:1 3/5
a=3/5b
b=96m :8/5
a=3/5b
b=96m*5/8
a=3/5b
b=480/8m
a=3/5b
b=60m
a=3/5*60m
b=60m
a=36m
b=60m
P=36m*60m
P=2160m²
1ar=100m²
2160:100=21,6
odp.działka ma powierzchnię 21,6 a