-18n - 12n + 7.3n + 6.5n = (-18 - 12 + 7.3 + 6.5)n
= (-30 + 13.8)n = -16.2n
Ответ: -16.2n
\[\frac{2}{9}m + \frac{2}{9}m - \frac{3}{9}m - \frac{5}{9}m = (\frac{2}{9} + \frac{2}{9} - \frac{3}{9} - \frac{5}{9})m\]
\[= (\frac{4}{9} - \frac{8}{9})m = -\frac{4}{9}m\]
Ответ: -4/9 m
\[\frac{2}{3}a - \frac{1}{6}a + \frac{1}{2}a - \frac{1}{12}a = (\frac{2}{3} - \frac{1}{6} + \frac{1}{2} - \frac{1}{12})a\]
\[=(\frac{8}{12} - \frac{2}{12} + \frac{6}{12} - \frac{1}{12})a = \frac{11}{12}a\]
Ответ: 11/12 a
b + 0.4b - \frac{1}{5}b - \frac{1}{2}b = (1 + 0.4 - \frac{1}{5} - \frac{1}{2})b
= (1 + 0.4 - 0.2 - 0.5)b = (1.4 - 0.7)b = 0.7b
Ответ: 0.7b