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1/2x10x7=5x7=35
2.
2.5dm=25cm
1/2x8x25=4x25=100
3.
x:3
x-liczba
5.
16dm2= 1600cm2
6.
0.9dm2= 90cm2
7.
270cm2= 2.7dm2
8.
4.5m2= 45000cm2
9.
42ha=4200a
10.
6.75ha=675a
11.
18a=0.18ha