5.61 Приведите подобные слагаемые: a) 20x + y - 20y x; б) -4b + 5a + 46 + 5а; в) -9с + 4,8n + 4c + 4n; г) 5,3m + 4,7m - 7,1x + 25x; д) 3 4. 4 6 7 y 22 2 2 3

a) 20x + y - 20y - x = (20x - x) + (y - 20y) = 19x - 19y

б) -4b + 5a + 4b + 5a = (5a + 5a) + (-4b + 4b) = 10a + 0 = 10a

в) -9c + 4.8n + 4c + 4n = (-9c + 4c) + (4.8n + 4n) = -5c + 8.8n

г) 5.3m + 4.7m - 7.1x + 25x = (5.3m + 4.7m) + (-7.1x + 25x) = 10m + 17.9x

д) \(\frac{3}{4}z - \frac{9}{4}y + \frac{22}{7}z + \frac{3}{2}y = (\frac{3}{4}z + \frac{22}{7}z) + (-\frac{9}{4}y + \frac{3}{2}y) = (\frac{21}{28}z + \frac{88}{28}z) + (-\frac{9}{4}y + \frac{6}{4}y) = \frac{109}{28}z - \frac{3}{4}y\)