bonjour
a . - 9 x ( - 4 ) = 36 x 5 = 180
b. - 6 x - 8 = 48 x - 0.5 = - 24
a . 80 : ( - 5 ) = - 16 : 4 = - 1
b . - 8 : 3 = - 24 : - 4 = 6