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 $2-\frac{8}{15}×\frac{9}{16}$

 $=2-\frac{3}{10}$

 $=1\frac{7}{10}$

 $1-\frac{8}{9}×\frac{3}{8}×\frac{1}{7}$

 $=1-\frac{1}{3}×\frac{1}{7}$

 $=1-\frac{1}{21}$

 $=\frac{20}{21}$

 $[1-(\frac{3}{4}-\frac{3}{8})]÷\frac{5}{6}$

 $=[1-\frac{3}{8}]×\frac{6}{5}$

 $=\frac{5}{8}×\frac{6}{5}$

 $=\frac{3}{4}$

 $5-(\frac{6}{7}÷\frac{3}{14}+\frac{6}{13})$

 $=5-(\frac{6}{7}×\frac{14}{3}+\frac{6}{13})$

 $=5-4-\frac{6}{13}$

 $=\frac{7}{13}$

 $6÷(\frac{3}{5}+\frac{3}{4})$

 $=6÷(\frac{12}{20}+\frac{15}{20})$

 $=6÷\frac{27}{20}$

 $=6×\frac{20}{27}$

 $=\frac{40}{9}$

 $1-\frac{6}{7}÷\frac{3}{7}×\frac{3}{16}$

 $=1-\frac{6}{7}×\frac{7}{3}×\frac{3}{16}$

 $=1-2×\frac{3}{16}$

 $=1-\frac{3}{8}$

 $=\frac{5}{8}$

 $=\left(\frac{6}{5}+\frac{4}{5}\right)\times\frac{2}{15}$

 $=2\times\frac{2}{15}$

 $=\frac{4}{15}$

 $=\frac{6}{11}\times\frac{1}{4}-\frac{1}{4}\times\frac{5}{11}$

 $=\frac{1}{4}\times\left(\frac{6}{11}-\frac{5}{11}\right)$

 $=\frac{1}{4}\times\frac{1}{11}$

 $=\frac{1}{44}$

 $=\left(\frac{7}{11}+\frac{4}{11}\right)\times\frac{7}{9}$

 $=1\times\frac{7}{9}$

 $=\frac{7}{9}$

 $=\frac{32}{33}\times(33-1)$

 $=\frac{32}{33}\times33-\frac{32}{33}\times1$

 $=32-\frac{32}{33}$

 $=31\frac{1}{33}$

$? =(\frac 65+\frac 45)×\frac 2{15}?$
$? =2×\frac 2{15}?$
$? =\frac 4{15}?$
$? =\frac 6{11}×\frac 14-\frac 14×\frac 5{11}?$
$? =\frac 14×(\frac 6{11}-\frac 5{11})?$
$? =\frac 14×\frac 1{11}?$
$? =\frac 1{44}?$
$? =(\frac 7{11}+\frac 4{11})×\frac 79?$
$? =1×\frac 79?$
$? =\frac 79?$
$? =\frac {32}{33}×(33-1)?$
$? =\frac {32}{33}×33-\frac {32}{33}?$
$? =32-\frac {32}{33}?$
$? =31\frac 1{33}?$

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