Bonjour pouvez vous m’aidez à mon exercice de maths svp merci d’avance

Salut

b. -2/9
c. 3/4+2/7
3×7/4×7+2×4/7×4
21/28+8/28
29/28

c. 1+2/3 = 1/1+2/3
1×3/1×3+2/3
3/3+2/3
5/3

2/3-2 = 2/3-2/1
2/3-2×3/1×3
2/3-6/3
-3/3

1/3+3/4+1/6
1×4/3×4+3×4/3×4+1/6
4/12+12/12+1/6
16/12+1/6
16/12+1×2/6×2
16/12+2/12
18/12

3×6/3×4
6/4
3×2/2×2
3/2