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Sagot :

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A  = 5 /35 - 14/35 = - 9 /35

B = 1/8 + 15/12 = 1/8 + 5/4 = 1/8 + 10/8 = 11 /8

C = 3 /7 : ( 10/42 - 15/42 ) = 3/7 : - 5 /42 = 3/7 * - 42/5 = - 126/35

   = - 18/5

D = ( 6/2 + 5/2 ) * 1/9 = 11/2 * 1/9  = 11*18

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