A= 6/7 + 12/35
= 6 × 5/7 × 5 + 12/35
= 30/35 + 12/35
= 42/35
= 42 ÷ 7/35 ÷ 7
= 6/5
B= 4/5 + 9/5 × 20/3
= 4/5 + 180/15
= 4 × 3/5 × 3 + 180/15
= 12/15 + 180/15
= 192/15
= 192 ÷ 3/15 ÷ 3
= 64/5
Voilà j’espère que tu as compris si tu as des questions j’y répondrai avec plaisir :)
