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1. 4 2/3 + 2 2/4= 14/3 + 10/4
= 56/12 + 30/12
= 86/12
= 43/6
2. 2 2/5 × 3 1/4
= 12/5 × 13/4
= 136/20
= 34/5
3. 12/13 : 3 3/11 - 1/8
= 12/13 : 36/11 - 1/8
= 12/13 × 11/36 - 1/8
= 132/468 - 1/8