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8x=4640
x=580
3*580=1740 <--- promień księżyca
11*580=6380 <--- promień Ziemi
r₂ - promień ziemi
r₁/r₂ = 3/11
r₂-r₁ = 4640
3r₂=11r₁
r₂= 4640+r₁
3×(4640+r₁)= 11r₁
13920 + 3r₁ = 11r₁
8r₁ = 13920 | :8
r₁ = 1740 km
r₂ = 4640 + r₁
r₂ = 4640 + 1740
r₂ = 6380 km
odp: Promień ziemi jest równy 6380 km a promień księżyca 1740 km.