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4,2-2,15=2,05
2 1/3 x 1 1/5=7/3 x 6/5=14/5=2 4/5=2,8
2,4: 1 5/7=2 2/5:1 5/7=12/5 x 7/12=7/5=1,4
zad 3
4,5-3 3/4=4,5-3,75=0,75
małe opakowanie proszku waży 0,75 kg.