193. Раскройте скобки и приведите подобные слагаемые: 1) 8(6x7) – 17x; 2) 9y - 5(17 - y); 3) 0,6(4x - 3) + 2,1(x - 5); 4) 2,5(4a - 8b) - (3a-4b) 1,4; 5)-(-5,2-3,1c) – (2,4c - 6,4); 6)(5--22-54). 9 X 16 3 7 20

8(6x - 7) - 17x = 48x - 56 - 17x = (48 - 17)x - 56 = 31x - 56

9y - 5(17 - y) = 9y - 85 + 5y = (9 + 5)y - 85 = 14y - 85

0,6(4x - 3) + 2,1(x - 5) = 2,4x - 1,8 + 2,1x - 10,5 = (2,4 + 2,1)x + (-1,8 - 10,5) = 4,5x - 12,3

2,5(4a - 8b) - (3a - 4b) \(\cdot\) 1,4 = 10a - 20b - 4,2a + 5,6b = (10 - 4,2)a + (-20 + 5,6)b = 5,8a - 14,4b

-(-5,2 - 3,1c) - (2,4c - 6,4) = 5,2 + 3,1c - 2,4c + 6,4 = (3,1 - 2,4)c + (5,2 + 6,4) = 0,7c + 11,6

\(\frac{9}{16}\) \(\cdot\) (5\(\frac{1}{3}\)x - \(\frac{2}{3}\)y) - \(\frac{7}{20}\) \(\cdot\) (2\(\frac{6}{7}\)x - 5\(\frac{5}{7}\)y) = \(\frac{9}{16}\) \(\cdot\) (\(\frac{16}{3}\)x - \(\frac{2}{3}\)y) - \(\frac{7}{20}\) \(\cdot\) (\(\frac{20}{7}\)x - \(\frac{40}{7}\)y) = (\(\frac{9}{16}\) \(\cdot\) \(\frac{16}{3}\))x - (\(\frac{9}{16}\) \(\cdot\) \(\frac{2}{3}\))y - (\(\frac{7}{20}\) \(\cdot\) \(\frac{20}{7}\))x + (\(\frac{7}{20}\) \(\cdot\) \(\frac{40}{7}\))y = 3x - \(\frac{3}{8}\)y - x + 2y = (3 - 1)x + (2 - \(\frac{3}{8}\))y = 2x + \(\frac{13}{8}\)y