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11x - długość promienia Ziemi
11x-3x = 4640
8x = 4640 /:8
x = 580 [km]
3x = 3*580
3x = 1740 [km]
11x = 11*580
11x = 6380 [km]
Odp. Długość promienia Księżyca wynosi 1740 km, a promienia Ziemi 6380 km.