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300*400=120000cm2
40*12=480cm2
120000/480=250
a= 3m =300cm
b = 4m = 400cm
P = 300cm* 400cm = 120000 cm²
a2 = 12 cm
b2 = 40 cm
P = 12cm * 40 cm = 480 cm²
120000 cm² / 480 cm² = 250
Odp.: Potrzeba 250 desek.