a)
(9dm+19dm) ×12
---------------------- = 28dm×6=168dm²
2
b)
(16cm+23cm)×20cm
---------------------------- = 39×10=390cm
c)
(6dm+9dm)×5dm
------------------------- = 15dm×2,5dm=37,5dm
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a)
(9dm+19dm) ×12
---------------------- = 28dm×6=168dm²
2
b)
(16cm+23cm)×20cm
---------------------------- = 39×10=390cm
2
c)
(6dm+9dm)×5dm
------------------------- = 15dm×2,5dm=37,5dm
2
liczę na naj