bonjour
merci de mettre profil collège et pas lycée
7/12 - 5 / 6 x 1/2
= 7/12 - 5/12
= 2 /12 = 1 /6
7/4 : 2 - 1 /6 x - 2/3
= 7/4 x 1/2 - 1/6 x - 2/3
= 7/8 + 2/18
= 63/72 + 8/72
= 71/72
7/12 : ( 5/6 + 1/2 )
= 7/12 : ( 5/6 + 3 /6 )
= 7/12 : 8/6
= 7/12 x 6/8
= 42/96
= 7/16
( 3/5)² - ( - 5 /6 )
= 9/25 + 5/6
= 54/150 + 125/150
= 179/150