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2. 41,7
3. 16,8
42 % liczby 12 wynosi około 5
56% liczby 30 wynosi około 17
obliczenia
84%-12
100%-x
x=100*12 : 84
x=14
x%-5
100%-12
x=100*5:12
x=42
56%-x
100%-30
x=56*30:100
x=17