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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