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P= a·b
P= 25dm · 30dm= 750 dm
L= 2a + 2b
L= 2· 25dm+ 2· 30dm= 110 dm
zad 2
(78 cm - 2·20cm)÷ 2 = 38÷ 2= 19
P= a·b
P= 20 cm · 19cm = 380 cm