Bonjour svp aider moi : pour l’exercice 2 merci d’avance ❤️

bonjour

ex 2

140 = 10 x 14 = 2 x 5 x 2 x 7 = 2² x 5 x 7

870 = 10 x 87 = 2 x 5 x 3 x 29 = 2 x 3 x 5 x 29

140/870 = 2 x 2 x 5 x 7 / 2 x 3 x 5 x 29 = 2 x 7 / 3 x 29 = 14/87

A = 15/435 + 22/290 x 5/3

A = 15/15x29 + 22x5 / 290x3

A = 1/29 + 11 x 2 x 5 / 29 x 2 x 5 x 3

A = 1/29 + 11/29x3

A = 3/29x3 + 11/29x3 = 14/87

bonjour

1 )

140 = 2 x 70

70 = 2 x 35

35 = 5 x 7

7 = 7 x 1

140 = 2 ² x 5 x 7

870  = 2 x 435

435 = 3 x 145

145 = 5 x 29

29 = 29 x 1

870 = 2 x 3 x 5 x 29

140/870 =  14/87

A = 15/435 + 22/ 290 x 5/3

   =  1/29 +  11/145 x 5 /3

   = 1/29  + 55 / 435

    =  15/435 + 55/435 = 70/435 = 14/87