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Sagot :

Bonjour,

A=3/4-2/3/8/15

(2/3)/8 = 2/(3*8) = 2/24 = 1/12

(1/12)/15 = 1/(12*15) = 1/180

3/4 -1/180 = 135/180 -1/180 = 134/180 = 67/90

B=7/15-4/15*5/8=

7/15 -(4*5)/(15*8) =

7/15 - 20/120=

56/120 -20/120=

36/120= 18/60  = 3/10

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