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17/5 + 5/6 - 7/15
17×6×15/5×6×15 + 5×5×15/6×5×15 - 7×6×5/15×6×5
1.530/450 + 375/450 - 210/450
2.115÷15/450÷15
141÷3/30÷3
47/10