2. Чему равно значение выражения: 1) 1/3 + 5/6; 2) 8/7 − 2/9; 3) 7/16 · 8/35; 4) 4/9 · 18; 5) 46/75 : 23/45; 6) 2/3 : 4; 7) 10 : 5/11; 8) 2 3/8 + 4 1/6; 9) 6 − 1 3/5; 10) 4 2/7 − 1 4/9; 11) 8 3/4 · 3/14; 12) 1 3/5 : 5 1/3.

1. \(\frac13+\frac56=\frac76=1\frac16\);
2. \(\frac87-\frac29=\frac{72-14}{63}=\frac{58}{63}\);
3. \(\frac7{16}\cdot\frac8{35}=\frac1{10}\);
4. \(\frac49\cdot18=8\);
5. \(\frac{46}{75}:\frac{23}{45}=\frac{46}{75}\cdot\frac{45}{23}=\frac65\);
6. \(\frac23:4=\frac16\);
7. \(10:\frac5{11}=22\);
8. \(2\frac38+4\frac16=6\frac{13}{24}\);
9. \(6-1\frac35=4\frac25\);
10. \(4\frac27-1\frac49=\frac{30}{7}-\frac{13}{9}=\frac{179}{63}=2\frac{53}{63}\);
11. \(8\frac34\cdot\frac3{14}=\frac{35}{4}\cdot\frac3{14}=\frac{15}{8}=1\frac78\);
12. \(1\frac35:5\frac13=\frac85:\frac{16}{3}=\frac3{10}\).

Ответ: 1) 1 1/6; 2) 58/63; 3) 1/10; 4) 8; 5) 1 1/5; 6) 1/6; 7) 22; 8) 6 13/24; 9) 4 2/5; 10) 2 53/63; 11) 1 7/8; 12) 3/10.