8 out of 9 divided by 2, 8 out of 9 divided by 4, 8 out of 9 divided by 8, 2 out of 15 divided by 1, 5 out of 7 divided by 5, 6 out of 11 divided by 3, 21 out of 15 divided by 14

8 out of 9 divided by 2, 8 out of 9 divided by 4, 8 out of 9 divided by 8, 2 out of 15 divided by 1, 5 out of 7 divided by 5, 6 out of 11 divided by 3, 21 out of 15 divided by 14

8/9÷2=8/9×1/2=4/9
8/9÷4=2/8
8/9÷8=1/9
2/15÷1=2/15
5/7÷5=1/7
6/11÷3=2/11
21/15÷14=21/15×1/14=1/10

It's 11 out of 14 and 9 out of 20, 4 out of 15 and 1 out of 3

11 out of 14 and 9 out of 20
Because the least common multiple of 14 and 20 is 140
So: 11 / 14:110 / 140
9/20：63/140
4 out of 15 and 1 out of 3
Because the least common multiple of 15 and 3 is 15
So:
4/15：4/15
1/3：5/15
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16 / 9 - (7 / 9 + 6 / 13)
Simple operation

Put it away
16 / 9 - (7 / 9 + 6 / 13)
=16/9-7/9-6/13
=9/9-6/13
=7/13;
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8 / 15 × [5 / 6 ÷ [7 / 9-1 / 3]]
Step by step calculation

8 / 15 × [5 / 6 ÷ [7 / 9-1 / 3]]
=8 / 15 × (5 / 6 ÷ 4 / 9)
=8 / 15 × 15 / 8
=1
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