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4/15÷(5/6)+11/15×6/5=4/15×6/5+11/15×6/5=(4/15+11/15)×6/5=1×6/5=6/5
4/15÷(5/6)+11/15×6/5=4/15×6/5+11/15×6/5=6/5×(4/15+11/15)=6/5