2. а) 4m - 6m - 3m + 7 + m; б) 5/9 * (3.6a - 3 3/5 b) - 3.5 * (4/5 a - 0.2b); в) 8(k - 3) + 4(k - 2) - 2(3k + 1).

2. Упростите выражение:

1. \( 4m - 6m - 3m + 7 + m = (4 - 6 - 3 + 1)m + 7 = -4m + 7 \)
2. \( \frac{5}{9} (3.6a - 3 \frac{3}{5}b) - 3.5 \left(\frac{4}{5}a - 0.2b\right) = \frac{5}{9} (3.6a - 3.6b) - 3.5(0.8a - 0.2b) = \frac{5}{9} \cdot 3.6a - \frac{5}{9} \cdot 3.6b - 3.5 \cdot 0.8a + 3.5 \cdot 0.2b = 2a - 2b - 2.8a + 0.7b = (2 - 2.8)a + (-2 + 0.7)b = -0.8a - 1.3b \)
3. \( 8(k - 3) + 4(k - 2) - 2(3k + 1) = 8k - 24 + 4k - 8 - 6k - 2 = (8 + 4 - 6)k + (-24 - 8 - 2) = 6k - 34 \)

Ответ: а) -4m + 7; б) -0.8a - 1.3b; в) 6k - 34.