2. Упростите выражение: a) 3n-8n-5n+2+2n; б) -3(a-2)+6(a-4)-4(3a+2); в) (4,8p-4k-4,5-0,4k).

2. Упростите выражение:

a) 3n - 8n - 5n + 2 + 2n

3n - 8n - 5n + 2 + 2n = (3 - 8 - 5)n + 4 = -10n + 4 = 4 - 10n

б) -3(a-2) + 6(a-4) - 4(3a+2)

-3(a - 2) + 6(a - 4) - 4(3a + 2) = -3a + 6 + 6a - 24 - 12a - 8 = (-3 + 6 - 12)a + 6 - 24 - 8 = -9a - 26 = -9a - 26

в) (4.8p-4k-4,5-0.4k)

(4.8p-4k-4,5-0.4k) = 4.8p - 4k - 4.5p + 0.4k = (4.8 - 4.5)p + (-4 + 0.4)k = 0.3p - 3.6k = 0.3p - 3.6k