bonjour
a/ 10/3+8/9=90/27+24/27=114/27=38/9
b/2/5*4/7=8/35
c/3/2+(3/4*7/3)=3/2+21/12=18/12+21/12=39/12=13/4
d/5/4*(4/3-7/15)=5/4*(20/15-7/15)=5/4*13/15=65/60=13/12
e/1/2:(3/4+1/6)=1/2:(18/24+4/24)=1/2:22/24=1/2*24/22=24/44=6/11
* veut dire multiplier
: veut dire diviser