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K:Z = 3:11
Z - K = 4640 →Z = 4640 + K
proporcja:
K --- 3
4640+K ---11
11K = 3(4640 + K)
11K = 13 920 + 3K
8K = 13 920
K = 1740km
Z = 4640 + 1740 = 6380km
odp. Promień Księżyca wynosi 1740km, a Ziemi 6380km
3*(x+4640)=11x
3x+13920=11x
13920=11x-3x
13920=8x/ :8
x=1740
promień ziemi=1740+4640=6380(km)
promień księżyca=1740(km)