1/6,后面那个算起来应该是1
1/6÷(1-16/7-16/9)=1/6÷(-9/7-16/9)=1/6÷(-81/63-112/63)=1/6×(-63/193)=-21/386
1/6÷(1-16/7-16/9)=1/6÷(1-144/63-112/63)=1/6÷(1-256/63)=-1/6÷193/63=-1/6X63/193=-21/386
1/6/(1-16/7-16/9)