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v₁ = v₂ (1 : 1)
f₁ = 2 . f₂ (2 : 1)
ditanya =
λ₁ : λ₂ = ... : ...
dijawab =
v₁ = f₁ . λ₁
λ₁ = v₁ / f₁
= 1 / 2
= 0,5
v₂ = f₂ . λ₂
λ₂ = v₂ / f₂
= 1 / 1
= 1
λ₁ : λ₂ = 0,5 : 1
= 1 : 2 (a)