4.° Вычислите: 1) |7/12| + |-5/9|; 2) |-3 3/9| - |-2 1/6|.

1) $$|\frac{7}{12}| + |-\frac{5}{9}| = \frac{7}{12} + \frac{5}{9} = \frac{7 \cdot 3}{12 \cdot 3} + \frac{5 \cdot 4}{9 \cdot 4} = \frac{21}{36} + \frac{20}{36} = \frac{41}{36} = 1 \frac{5}{36}$$ 2) $$|-3 \frac{3}{9}| - |-2 \frac{1}{6}| = |-\frac{30}{9}| - |-\frac{13}{6}| = \frac{30}{9} - \frac{13}{6} = \frac{30 \cdot 2}{9 \cdot 2} - \frac{13 \cdot 3}{6 \cdot 3} = \frac{60}{18} - \frac{39}{18} = \frac{21}{18} = \frac{7}{6} = 1 \frac{1}{6}$$ Ответ: 1) $$1 \frac{5}{36}$$ 2) $$1 \frac{1}{6}$$