Bonsoir,
C)
9/7 * 9/9 = 81/63
d= 13/2 * 5/5 = 65/10
E=8/8 * 4/4 = ?B= 10/11 * 7/7 = ?
C= 36/42
36/6 = 6
42/6 = 7
36/42 = 6/7
72/8 = 9
81/9 = 9
81/72 = 9/8