Aider moi pr c'est 3 fractions svp : A=1/3 + 5/6 B=7/5 - 3/10 C= 1/3 - 7/9

A= 1/3 + 5/6
A= (1*2)/(3*2) + 5/6
A= 2/6 + 5/6
A= 7/6

B= 7/5 - 3/10
B= (7*2)/(5*2) - 3/10
B= 14/10 - 3/10
B= 11/10

C= 1/3 - 7/9
C= (1*3)/(3*3) - 7/9
C= 3/9 - 7/9
C= - 4/9

A=1/3+5/6=7/6
B=7/5-3/10=11/10
C=1/3-7/9=10/9
Voilà