395. Выполните приведение подобных слагаемых: a) 10a + b- 10b - a; б) -8у + 7x + 6y + 7x; в) -8х + 5,2a + 3x + 5a; г) 5а + 7а – 9,2m + 15m; д) \frac{2}{7}x - \frac{4}{9}y - \frac{5}{14}x + \frac{2}{3}y; e) -6a + 5a - x + 4; ж) 23х - 23 + 40 + 4x; з) -а + x + 1,1a – 1,3x; и) -12р + 3k + 3,2p - 2,3k; к) 0,5a - \frac{2}{3}b - \frac{2}{5}a - \frac{1}{3}b.

a) 10a + b - 10b - a = (10a - a) + (b - 10b) = 9a - 9b

б) -8y + 7x + 6y + 7x = (7x + 7x) + (-8y + 6y) = 14x - 2y

в) -8x + 5,2a + 3x + 5a = (5,2a + 5a) + (-8x + 3x) = 10,2a - 5x

г) 5a + 7a – 9,2m + 15m = (5a + 7a) + (-9,2m + 15m) = 12a + 5,8m

д) \(\frac{2}{7}x - \frac{4}{9}y - \frac{5}{14}x + \frac{2}{3}y = (\frac{2}{7}x - \frac{5}{14}x) + (\frac{2}{3}y - \frac{4}{9}y) = (\frac{4}{14}x - \frac{5}{14}x) + (\frac{6}{9}y - \frac{4}{9}y) = -\frac{1}{14}x + \frac{2}{9}y\) = \(-\frac{1}{14}x + \frac{2}{9}y\)

e) -6a + 5a - x + 4 = (-6a + 5a) - x + 4 = -a - x + 4

ж) 23x - 23 + 40 + 4x = (23x + 4x) + (-23 + 40) = 27x + 17

з) -a + x + 1,1a – 1,3x = (-a + 1,1a) + (x - 1,3x) = 0,1a - 0,3x

и) -12p + 3k + 3,2p - 2,3k = (-12p + 3,2p) + (3k - 2,3k) = -8,8p + 0,7k

к) 0,5a - \frac{2}{3}b - \frac{2}{5}a - \frac{1}{3}b = (0,5a - \frac{2}{5}a) + (-\frac{2}{3}b - \frac{1}{3}b) = (\frac{5}{10}a - \frac{4}{10}a) + (-\frac{3}{3}b) = \frac{1}{10}a - b = \(\frac{1}{10}a - b\)