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Sagot :

LELEKA216

Réponse :

Bonjour,

A= 7/4 - 4/3 :2/5

A= 7/4- 4/3* 5/2

A= 7/4 - 20/6

A= 21/12 -40/12

A= -19/12

B= 12/5-3/5*7/9

B= 12/5 - 21/45

B= 36/15- 7/15

B=29/15

C= (2/3-3/1):1/9

C= (2/3-9/3):1/9

C= -7/3 :1/9

C=-7/3*9/1

C= -63/3 = -21

D= 5+(1+1/8):3/4

D= 5+ 9/8:3/4

D= 5+ 36/24

D= 120/24+36/24

D=156/24=13/2

J'espère t'avoir aidé :)

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