2 вариант. 1. Вычислите: 1) 3/9 · 9/3; 2) 7/12 + 7/9; 3) 7/35 − 1/10.

1. \(\frac39\cdot\frac93=1\).
2. \(\frac7{12}+\frac79=\frac{21}{36}+\frac{28}{36}=\frac{49}{36}=1\frac{13}{36}\).
3. \(\frac7{35}-\frac1{10}=\frac15-\frac1{10}=\frac1{10}\).

Ответ: 1; \(1\frac{13}{36}\); \(\frac{1}{10}\).