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1/4*6+1/2*4=1.5+2=3.5(kg)
4*½kg=4/2=2 kg
łącznie= 1,5kg+2kg=3,5 kg
¹₂ kg= 0,5kg
0,25*6=1,5 kg
0,5*4= 2kg
1,5+2=3,5kg