Answer:
1. 5/7 - 2/7
2. 9/10 + 3/10
12/10 ÷ 2/2
3. 3/4 - 2/3
3×3/4×3 - 2×4/3×4
9/12 - 8/12
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Answer:
1. 5/7 - 2/7
= 3/7
2. 9/10 + 3/10
12/10 ÷ 2/2
= 6/5
3. 3/4 - 2/3
3×3/4×3 - 2×4/3×4
9/12 - 8/12
= 1/12