4.158 Выполните сложение: a) |-9| + |-5|; б) |-4,5| + |-3,7|; в) |-(5/11)| + |-(7/11)|; г) |-1(5/9)| + |-2(5/18)|

a) $$|-9| + |-5| = 9 + 5 = 14$$ б) $$|-4,5| + |-3,7| = 4,5 + 3,7 = 8,2$$ в) $$|-\frac{5}{11}| + |-\frac{7}{11}| = \frac{5}{11} + \frac{7}{11} = \frac{12}{11} = 1\frac{1}{11}$$ г) $$|-1\frac{5}{9}| + |-2\frac{5}{18}| = 1\frac{5}{9} + 2\frac{5}{18} = \frac{14}{9} + \frac{41}{18} = \frac{28}{18} + \frac{41}{18} = \frac{69}{18} = \frac{23}{6} = 3\frac{5}{6}$$ **Ответ:** а) 14; б) 8,2; в) $$1\frac{1}{11}$$; г) $$3\frac{5}{6}$$