plisss tolong jawab no 1,2,3,4,5 beserta caranya ya plisss

1. 1/9 × 18 = 1 × 18 : 9 = 2
2. 3/4 × 28 = 3 × 28 : 4 = 21
3. 1/10 × 75 = 1 × 75 : 10 = 7,5
4. 5/6 × 126 = 5 × 126 : 6 = 105
5. 2/5 × 181 = 2 × 181 : 5 = 72,5
maaf klo salah :)