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M  = 6/4 + 7/6

    = 1812 + 14/12

    = 32/12 = 8/3

N  = 1/9 - 5 /12

    =  4/36 - 15/36

    = - 11 /36

O = 7/10 - 2 /15

   =  21/30 - 4 /30

   = 17/30

p = - 36 /4 + 3 /14  

   = - 144/28 + 6/28

    =-  138/28

    =  - 69/14

1 - ( 1/3 + 3 /10 + 1 /5 )

=  30/30 - (10/30 + 9/30 + 6/30)

= 30/30 - 25/30

= 5/30 = 1 /6 de vert