作业帮[13.5+(11+2.25)/(1/&)-1/7]*7/6=293/12 求&
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[13.5+(11+2.25)/(1/&)-1/7]*7/6=293/12 求&
[13.5+(11+2.25)/(1/&)-1/7]*7/6=293/12 求&
[13.5+(11+2.25)/(1/&)-1/7]*7/6=293/12 求&
&=4/7
13.5+13.25&-1/7=293/14
13.25&=53/7
53/4&=53/7
&=4/7