Bonjour,
3/7+8/4=17/7
2/5-8/3=-34/15
25/9*12/35=20/21
8/5:-4/3=-6/5
(3/8-2):7/4=-13/14
Réponse :
Explications étape par étape
Bjr,
3/7+8/4=
12/28 + 56/28 = 68/28 = 34/14 = 17/7
2/5-8/3=
6/15 -40/15 = -34/15
25/9×12/35=
(25*12) / (9*35) =
300/ 420 = 30/42 = 15 /21=5/7
8/5÷ -4/3= (8*3) / (5*4) = 24/20 = 12/10 = 6/5
(3/8-2)÷7/4
3/8 -2 = 3/8 -4/8 = -1/8
-1/8 )/(7/4) = (-1 *4)/ (8*7) =
-4/ 56 = -1/14
☺