192. Приведите подобные слагаемые: 1) 8x17x19x + 21x; 2)-9y + 12y + 4ly - 17y; 3) 2,6a 5,46 - a + 2b; 4)-5,6c + 4,8 + 8,2c-9,1; 5) 4,6m + 8,3n-5,18,3m 6,4n; 6)-+--.

1) 8x - 17x - 19x + 21x = (8 - 17 - 19 + 21)x = -7x

2) -9y + 12y + 41y - 17y = (-9 + 12 + 41 - 17)y = 27y

3) 2,6a - 5,4b - a + 2b = (2,6 - 1)a + (2 - 5,4)b = 1,6a - 3,4b

4) -5,6c + 4,8 + 8,2c - 9,1 = (-5,6 + 8,2)c + (4,8 - 9,1) = 2,6c - 4,3

5) 4,6m + 8,3n - 5,1 - 8,3m - 6,4n = (4,6 - 8,3)m + (8,3 - 6,4)n - 5,1 = -3,7m + 1,9n - 5,1

6) -\(\frac{2}{5}\)a + \(\frac{5}{6}\)b - \(\frac{1}{8}\)a - \(\frac{7}{12}\)b = (-\(\frac{2}{5}\) - \(\frac{1}{8}\))a + (\(\frac{5}{6}\) - \(\frac{7}{12}\))b = (-\(\frac{16}{40}\) - \(\frac{5}{40}\))a + (\(\frac{10}{12}\) - \(\frac{7}{12}\))b = -\(\frac{21}{40}\)a + \(\frac{3}{12}\)b = -\(\frac{21}{40}\)a + \(\frac{1}{4}\)b