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Sagot :

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bonjour

B  = ( 7/4 - 2 /4 ) * ( 7/5 + 2/5)

B = 5/4 * 9/5

B = 45/20

B = 9 /4

C = 17/14 - ( 3/2 * 5/7 )

C = 17/14 - 15/14

C = 2/14

C = 1/7

D = ( 7/12 + 1/6 ) * 3/2

D =  ( 7/12 + 2/12 ) * 3 /2

D = 9/12 * 3/2

D = 27/24

D = 9/8

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