Bonsoir,
f. 9/7 x ...... = -18/21.
9 x ? = -18 --> 9 x -2 = -18
7 x ? = 21 --> 7 x 3 = 21
==>> 9/7 x -2/3 = -18/21.
g. -5 x 4/... = .../11 -5 = -5/1
-5 x 4 = -20
1 x 11 = 11
==>> -5 x 4/11 = -20/11.
h. -3/7 x 15/... = .../63
-3 x 15 = -45
63 ÷ 7 = 9
==>> -3/7 x 15/9 = -45/63
Bonne soirée
