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Verified answer
1. 2 5/6 + 3 17/20(6×2+5)/6 + (20×3+17)/20
17/6 + 77/20
17×20/6×20 + 77×6/20×6
340/120 + 462/120
802÷2/120÷2
401/60
6 41/60
2. 4 12/15 + 9 15/20
(15×4+12)/15 + (20×9+15)/20
72/15 + 195/20
72×20/15×20 + 195×15/20×15
1.440/300 + 2.925/200
4.365÷15/300÷15
291/20
10 91/20
3. 9 9/12 + 2 15/18
(12×9+9)/12 + (18×2+15)/18
117/12 + 51/18
117×18/12×18 + 51×12/18×12
2.106/216 + 612/216
2.718÷9/216÷9
302÷2/24÷2
151/12
12 7/12