Répondre :

L = - 7/5  : ( 2/9 - 7 /18 )

  = - 7 /5  :  ( 4/18 - 7/18 )

  = - 7/5   :  3 /18

  =  - 7/5 x 18/3

  = - 126/15

M = ( 4/5 - 3 /2 ) : ( - 9/4 - 1/6 )

  = ( 8/10 - 15/10 ) : ( - 27/12 - 2 /12 )

  = - 7 /10 : - 29/12

  = - 7/10 x - 12/29

  = 84/290

  = 42 /145

L = -7/5 ÷ (4/18 - 7/18)

= -7/5 ÷ -3/18

= -7/5 × -18/3

= 126/15

M = (8/10 -15/10) ÷ (-27/12 -2/12)

= -7/10 ÷ -29/12

= -7/10 × -12/29

= 84/290 = 42/145

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