8) 5\alpha - 9,2m + 7\alpha + 15m

Привет! Давай упростим эти выражения, приведя подобные слагаемые. 8) $5\alpha - 9,2m + 7\alpha + 15m = (5\alpha + 7\alpha) + (-9,2m + 15m) = 12\alpha + 5,8m$ 9) $\frac{2}{7}x - \frac{4}{9}y - \frac{5}{14}x + \frac{2}{3}y = (\frac{4}{14}x - \frac{5}{14}x) + (-\frac{4}{9}y + \frac{6}{9}y) = -\frac{1}{14}x + \frac{2}{9}y$ 10) $-6\alpha + 5\alpha - x + 4x = -\alpha + 3x = 3x - \alpha$ 11) $23x - 23 + 40 + 4x = (23x + 4x) + (-23 + 40) = 27x + 17$ 12) $4x - 2\alpha + 6x - 3\alpha + 4 = (4x + 6x) + (-2\alpha - 3\alpha) + 4 = 10x - 5\alpha + 4$ 13) $-6,3m + 8 - 3,2m - 5 = (-6,3m - 3,2m) + (8 - 5) = -9,5m + 3$ 14) $4\alpha - 6\alpha - 2\alpha + 12 - 11 = -4\alpha + 1$ 15) $0,2m - \frac{2}{9} - 4m + \frac{5}{9} = (0,2m - 4m) + (-\frac{2}{9} + \frac{5}{9}) = -3,8m + \frac{3}{9} = -3,8m + \frac{1}{3}$ 16) $\frac{1}{2}\alpha + \frac{1}{3}c - \frac{1}{2}\alpha + \frac{2}{3}c = (\frac{1}{2}\alpha - \frac{1}{2}\alpha) + (\frac{1}{3}c + \frac{2}{3}c) = c$ 17) $0,7x - 6y - 2x + 0,8y = (0,7x - 2x) + (-6y + 0,8y) = -1,3x - 5,2y$ 18) $\frac{2}{7}\alpha + \frac{1}{6}p - \frac{5}{7}\alpha + \frac{5}{6}p = (\frac{2}{7}\alpha - \frac{5}{7}\alpha) + (\frac{1}{6}p + \frac{5}{6}p) = -\frac{3}{7}\alpha + p = p - \frac{3}{7}\alpha$ 19) $7,4x - 5,3y + 6,6x - 3,7y = (7,4x + 6,6x) + (-5,3y - 3,7y) = 14x - 9y$