Question

3/4-7/9
8/12-3/9
4/5÷3/4
7/9÷2/7
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Answer 1

3/4 - 7/9

= 27/36 - 28/36

= 27 - 28/36

= -1/36

8/12 - 3/9

= 2/3 - 1/3

= 2 - 1/3

= 1/3

4/5 ÷ 3/4

= 4 × 4/5 × 3

= 16/15

7/9 ÷ 2/7

= 7 × 7/9 × 2

= 49/18

Suerte,salu2!