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O= 33cm
Łatwe:D
2a+2b=66m
a=3b-3m
1/3a=3b-1m = x
x= 66m-6m:8=60m:8=7.5m
b=7,5m+3m=10,5m
a= 3*7,5m=22,5m
spr. obw=2*10,5+2*22,5m=21=45+66m
tak jak robimy w szkole