5÷【（2/3+1/5）×1/13】=5÷[(10/15+3/15)×1/13]=5÷(13/15×1/13)=5÷1/15=75
5÷【（2/3+1/5）×1/13】=5÷【（10/15+3/15）×1/13】=5÷【13/15×1/13】=5÷1/15=5×15=75
5÷[（2/3+1/5）×1/13]=5÷(13/15×1/13)=5÷1/15=75
等于75
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