1. а) 3/4 − 3/16; б) 8/9 + 1 5/6; в) 2 11/36 − 1 23/24; г) 7 1/2 − 2 2/3; д) 6 4/25 : 15 2/5.

1. \(\frac34-\frac{3}{16}=\frac{12}{16}-\frac{3}{16}=\frac9{16}\).
2. \(\frac89+1\frac56=\frac89+\frac{11}{6}=\frac{16}{18}+\frac{33}{18}=\frac{49}{18}=2\frac7{18}\).
3. \(2\frac{11}{36}-1\frac{23}{24}=\frac{83}{36}-\frac{47}{24}=\frac{166}{72}-\frac{141}{72}=\frac{25}{72}\).
4. \(7\frac12-2\frac23=\frac{15}{2}-\frac83=\frac{45-16}{6}=\frac{29}{6}=4\frac56\).
5. \(6\frac4{25}:15\frac25=\frac{154}{25}:\frac{77}{5}=\frac{154}{25}\cdot\frac5{77}=\frac25\).

Ответ: а) \(\frac9{16}\); б) \(2\frac7{18}\); в) \(\frac{25}{72}\); г) \(4\frac56\); д) \(\frac25\).