5.114 Приведите подобные слагаемые: a) 7,3x + 4x; б) За – 5a; 4 в) n-n; 5 г) -5/7 m + m; д) 2,1х + 4,5x – 1,9x; 7 8 4 e) a + a -а; 4 11 11 ж) -6а - а + 7; 3) 9n - 5y - 4n + 7y; и) 3,6х + 5,1у - 2,9x – 4,2y.

• a) 7.3x + 4x = 11.3x
• б) 3a - 5a = -2a
• в) n - \(\frac{4}{5}\)n = \(\frac{5}{5}\)n - \(\frac{4}{5}\)n = \(\frac{1}{5}\)n
• г) -\(\frac{5}{7}\)m + m = -\(\frac{5}{7}\)m + \(\frac{7}{7}\)m = \(\frac{2}{7}\)m
• д) 2.1x + 4.5x - 1.9x = 6.6x - 1.9x = 4.7x
• е) \(\frac{7}{4}\)a + \(\frac{8}{11}\)a - \(\frac{4}{11}\)a = \(\frac{7}{4}\)a + \(\frac{4}{11}\)a = \(\frac{77}{44}\)a + \(\frac{16}{44}\)a = \(\frac{93}{44}\)a
• ж) -6a - a + 7 = -7a + 7
• з) 9n - 5y - 4n + 7y = 5n + 2y = 5n + 2y
• и) 3.6x + 5.1y - 2.9x - 4.2y = 0.7x + 0.9y = 0.7x + 0.9y

Ответ: a) 11.3x; б) -2a; в) \(\frac{1}{5}\)n; г) \(\frac{2}{7}\)m; д) 4.7x; е) \(\frac{93}{44}\)a; ж) -7a + 7; з) 5n + 2y; и) 0.7x + 0.9y