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v1 : v2 = r1^3 : (3r1)^3
v1 : v2 = r1^3 : 27 r1^3 (coret r1^3)
v1 : v2 = 1 : 27 [A]
= (r1)³ : (r2)³
= (r1)³ : (3 .r1)³
= (r1)³ : 27.(r1)³
= 1 : 27