Explications étape par étape
a. 2/3 : 5 = 2/3 x 1/5 = 2/15
b. - 5/7 : ( - 4 ) = 5/7 x 1/4 = 5/28
c. 5/6 : ( - 7/11 ) = 5/6 x ( - 11/7 ) = - 55/41
d. 8 : 1/8 = 8 x 8 = 64
e. - 3/2 : ( - 5/7 ) = 3/2 x 7/5 = 21/10
f. 1/10 : ( - 7/9 ) = 1/10 x ( - 9/7 ) = - 9/70
g. - 8/15 : ( - 4/5 ) = 8/15 x 5/4 = 40/60 = 2/3
h. 9/10 : ( - 3 ) = 9/10 x ( - 1/3 ) = - 9/30 = - 3/10
i. - 4/45 : 16/15 = - 4/45 x 15/16 = - 60/720 = - 1/12
j. - 5/6 : ( - 15/18 ) = 5/6 x 18/15 = 90/90 = 1
k. 12 : ( - 3/4 ) = 12 x ( - 4/3 ) = - 48/3 = - 16
l. 1 : ( - 7/4 ) = 1 x ( - 4/7 ) = - 4/7
