calculer:detailler chaque étape A=7/9-(1-2/3)²x2 B=5/4-3 _____ 2x11/6

bonjour

a = 7/9 - ( 1 -2/3)² x 2
a = 7/9 - ( 3/3 - 2/3)² x 2
a = 7/9 - (1/3)² x 2
a = 7/9 - 1/9 x 2
a = 7/9 - 2/9 = 5/9

b = (5/4 - 3) : 2 x 11/6
b = ( 5/4 - 12/4) : 22 /6
b = - 7/4 x 6/22
b = - 42/88 = - 21/44