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40,8m²+10%*40,8m²=
40,8m²+0,1*40,8m²=
40,8m²+4,08m²=
44,88m²
odp.trzeba kupić 44,88m² tapety
b)
pole rolki
50cm=0,5m
P=0,5m*10m
P=5m²
44,88m² : 5m²=8,976= ≈9
odp.trzeba kupić 9 rolek tapety