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b) (14*3):2=21dm2
c) (22*14,5):2=159,5dm2
d) (2,8*5):2=7dm2
2dm
P=½*0,8*2=0,8dm²
b )14dm
3dm
P=½*14*3=½*42=21dm²
c) 22dm
145cm=14,5dm
P=½*22*14,5=11*14,5=159,5dm²
d) 28cm=2,8dm
5dm
P=½*2,8*5=1,4*5=7dm²