a=1 4/5m
b=2/3*1 4/5=2/3*9/5=18/15=6/5m
P=a*b
P=1 4/5*6/5= 9/5*6/5=54/25=2 4/25m2-powierzchnia okna
Jeżeli okno ma 1 i 4/5 m wysokości
1 4/5m*1=9/5m*1=9/5m
9/5m*2/3m=18/15m=1 1/5m
P=9/5m*6/5m=2,16m2
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a=1 4/5m
b=2/3*1 4/5=2/3*9/5=18/15=6/5m
P=a*b
P=1 4/5*6/5= 9/5*6/5=54/25=2 4/25m2-powierzchnia okna
Jeżeli okno ma 1 i 4/5 m wysokości
1 4/5m*1=9/5m*1=9/5m
9/5m*2/3m=18/15m=1 1/5m
P=9/5m*6/5m=2,16m2