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Obw = a+a + b+b
a=3,5
b=4,5
b= 4.5 2a+2b = 16
3.5/0.5=7
4.5/0.5=9
stosunek 7:9
16a=8
a=1/2
7*1/2=a
a=7/2
b=9/2