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V1:V2= 4/3r³ : 4/3r³
27:8 = r³ : r³
∛27 : ∛8 = r : r
3 : 2 = r : r
L1:L2= 4r² : 4r²
= r² :r²
= 3² : 2²
= 9 : 4 (C)