Calculer en décomposant. On donnera le résultat en fraction irréductible

J = 2/3 x 5/-2
K = 4/0,5 x 7/4 x -0,5/2
L = -9/4 x 8/3
M = -12/-7 x -21/-8
N = 3/5 x -5/12

merci d'avance de votre aide
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