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Answer:

1. 8/11 + 3/11

11/11 ÷ 11/11

= 1

2. -6/15 + (-9/15)

-6/15 - 9/15

-15/15 ÷ 15/15

= -1

3. 13/7 - 5/7

= 8/7

4. -8/10 - (-7/10)

-8/10 + 7/10

= -1/10

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1. 8/4 + 2/7

8×7/4×7 + 2×4/7×4

56/28 + 8/28

64/28 ÷ 4/4

= 16/7

2. -2/3 + (-9/5)

-2/3 - 9/5

-2×5/3×5 - 9×3/5×3

-10/15 - 27/15

= -37/15

3. 13/7 - 5/2

13×2/7×2 - 5×7/2×7

26/14 - 35/14

= -9/14

4. -8/5 - (-7/2)

-8/5 + 7/2

-8×2/5×2 + 7×5/2×5

-16/10 + 35/10

= 19/10

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