2 per 9 + 0,5 - 0,1 : 1 per 7 =.......

2/9 + 0,5 - 0,1 : 1/7

= 2/9 + 5/10 - 1/10 × 7/1

= 20/90 + 45/90 - 7/10

= 65/90 - 63/90

= 2/90

= 1/45

Semoga membantu yaa.. jadikan jawaban ter-Brainly yaahh.. makasi