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15×п= 15×3,14=47,1
b2п×⅖=⅘п
⅘×п=⅘× 3,14=2,512
c)
d) п×3,2=3,2п
3,2×п= 3,2×3,14= 10,05
b) 4/5 pi
c) 2 pierwiastków z 2 pi
d) 6.4 pi
e) 66 pi
f) 6 pierwiastków z 2 pi