1. Найдите значение выражения: а) \(\frac{23}{81}\cdot 3\frac{6}{7}\); б) \(\frac{7}{8}:1\frac{5}{16}\cdot 3\frac{1}{2}\); в) \((9\frac{1}{5}-3\frac{17}{25})\cdot 2\frac{1}{2}\); г) \(6{,}24:1{,}56-(5{,}62-3{,}8)\cdot 0{,}6\).

1. \(\frac{23}{81}\cdot3\frac67=\frac{23}{81}\cdot\frac{27}{7}=\frac{23}{21}\).
2. \(\frac78:1\frac5{16}\cdot3\frac12=\frac78:\frac{21}{16}\cdot\frac72=\frac78\cdot\frac{16}{21}\cdot\frac72=\frac43\).
3. \((9\frac15-3\frac{17}{25})\cdot2\frac12=(\frac{46}{5}-\frac{92}{25})\cdot\frac52=(\frac{230-92}{25})\cdot\frac52=\frac{138}{25}\cdot\frac52=\frac{69}{5}=13\frac45\).
4. \(6{,}24:1{,}56-(5{,}62-3{,}8)\cdot0{,}6=4-1{,}82\cdot0{,}6=4-1{,}092=2{,}908\).

Ответ: а) \(\frac{23}{21}\); б) \(\frac43\); в) \(13\frac45\); г) \(2{,}908\).