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70cm x 300cm= 21000cm^2 = 2,1m^2 odp C
4cm=40 mm
40 mm x 12 mm=480mm^2=4,8cm^2 odp D
wydaje mi sie ze jest okej :)
a) 300 * 70 = 21000 cm2
b) 40 * 12 = 480 mm2