jé fait d calcul dites moi si c juste svp

6/4 + 8/6 = 6x6/4x6 = 36/24
= 8x4/6x4 = 32/24
= 36/24 + 32/24
= 68/24

5/3 - 7/4 = 5x4/3x4 = 20/12 = 7x3/4x3 = 20/12 - 21/12 = -1/12

9/4 x 8/6 = 9x8/4x6 = 72/24 = 3

3 + 4/5 = 3x5/1x5 = 15/5 = 4x1/5x1 = 4/5 = 15/5 + 4/5 = 19/5

-5/8 / -75/21 = 8x21/-5x-75 = 168/ -80

voila

et une derniere division

6/3 / 4/5 = 3x5/6x4 = 15/24 ? ??

voila reponder moi svp car g plus bocoup de temps!

je te les corrige :

6/4 + 8/6 = 36/24 + 32/24 = 68/24 = 17/6
5/3 - 7/4 = 20/12 - 21/12 = -1/12
9/4 x 8/6 = 72/24 = 9/3
3 + 4/5 = 15/5 + 4/5 = 19/5
-5/8 / -75/21 = -5/8 x -21/75 = 105/600 = 21/120
6/3 / 4/5 = 6/3 x 5/4 = 30/12 = 5/2

pour la division donc la premiere fraction on la laisse comme elle est puis la 2eme on inverse le denominateur et le num?