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Sagot :

Salut !

A = (12/5) ÷ (26/(-25))

  =  (12/5) × (-25/26)

  =  (12×(-25))/(5×26)

  =  (3×2×2×5×(-5))/(5×2×13)

  =  (3×2×(-5))/13

  =   -30/13

pour B, est-ce (-2/11)/9 ou -2/(11/9) ?

(-2/11)/9 = (-2/11) × 1/9 = -2/99

-2/(11/9) = -2 × (9/11) = -18/11

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