Sagot :

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bonjour

D  =  3 + 2 /5 - 8 /15

  =  45/15 + 6 /15 - 8 /15

  =  43 /15

E = 34/40 x 27/51

  = 918/2040

  =  9/ 20

F  = 3/4 - 5/4 x 2 /3

  = 3 /4 - 10 /12

  =  9/12 - 10 /12

  = - 1 /12

G  =  8/21 : 4 /7

    = 8 /21 x 7/4

    =  56/84

    =  2/ 3

maudmarine

Bonjour

D= 3+2/5-8/15

D = (3 x 15) / (1 x 15) + (2 x 3) / (5 x 3) - 8/15

D = 45/15 + 6/15 - 8/15

D = 51/15 - 8/15

D = 43/15

E= 34/40×27/51

E = 918/2040

E = (102 x 9) / (102 x 20)

E = 9/20

F= 3/4-5/4×2/3

F = 3/4 - 10/12

F = (3 x 3) / (4 x 3) - 10/12

F = 9/12 - 10/12

F = - 1/12

G= 8/21 : 4/7

G = 8/21 x 7/4

G = 56/84

G = (28 x 2) / (28 x 3)

G = 2/3.