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0,1 ha=1000m2
100m2---x
1000m2--100
x=100*100/1000=10
trzeba układać takie proporcje jak powyżej
b)
0,13ha=1300m2
1300--140
100---x
x=14000/1300
x=10
c)
0,45ha =4500m2
4500--150
100--x
x=15000/4500=3
d)
0,6 ha=6000m2
6000---290
100----x
x=29000/6000=4