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5/2=2,5
6/2,5=2,4
8/2,5=3,2
((3,2+2,4)*2)/2=(5,6*2)/2=11,2/2=5,6
((8+6)*5)/2=(14*5)/2=70/2=35
35-5,6=29,4
Odp.: Pole zakreskowanej figury wynosi 29,4cm².