a) $$rac{2}{3} = 0,666... = 0,(6)$$
b) $$-\frac{2}{7} = -0,285714285714... = -0,(285714)$$
г) $$18 = 18,0 = 18,(0)$$
д) $$-23 = -23,0 = -23,(0)$$
e) $$-\frac{12}{15} = -\frac{4}{5} = -0,8 = -0,8(0)$$
ж) $$4\frac{3}{8} = 4 + \frac{3}{8} = 4 + 0,375 = 4,375 = 4,375(0)$$
з) $$5\frac{19}{33} = 5 + \frac{19}{33} = 5 + 0,575757... = 5,(57)$$