bonjour
a = -2/3 +9/4 -1 = -8/12 +27/12 -12/12 = -20/12+27/12 = 7/12
b = 7/4 -3/4 x8/9 = 7/4 - 1/2 x 2/3= 7/4 -2/6 = 7/4-1/3= 21/12-4/12= 17/12
a = (-2/3+15/8) : -7/12
a = (-16/24 +45/24) : -7/12
a = 29/24 x -12/7
a = 29/2 x -1/7
a = -29/14
b = 15/8( -2/3 + 7/12)
b = 15/8( -8/12+7/12)
b = 15/8 (-1/12)
b = -15 /96
