Déterminer si les vecteurs u et v sont colinéaires.

a.u(-3;21) et v(4;-28)
b.u(3;12) et v(12;3)
c.u(7/4;2/7) et v(1/2;4)
d.u(2/3;2) et v(1/5;3/5)

Merci !
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