Sagot :
Bonjour !
13/7 + (-8/7) / (-4/5)
= 13/7 + (-8/7) * (5/-4)
= 13/7 + (-8*5)/(-4*7)
= 13/7 + (-40/-28)
= 13/7 + 40/28
= 13/7 + (40:4)/(28/4)
= 13/7 + 10/7
= (13+10)/7
= 23/7
Bon courage !
Bonjour
13/7+(-8/7):(-4/5)
= 13/7 - 8/7 x - 5/4
= 13/7 + 40/28
= (13 x 4) / (7 x 4) + 40/28
= 52/28 + 40/28
= 92/28
= (4 x 23) / (4 x 7)
= 23/7.