1)calculer chaque expression.Donner le résultat le plus simple

B=(2/3+3/4)/(5/8-4/3)
B=(8/12+9/12)/(15/24-32/24)
B=(17/12)/(-17/24)
B=(17/12)×(-24/17)
B=-2

= 2/3 + 3/4 ÷ 5/8 - 4/3
= 8/12 + 9/12 ÷ 15/24 - 32/24
= 17/12 ÷ -17/24
<=> 17/12 × 24/-17
=408/-204
= -2