187. Упростите выражение и подчеркните его коэффициент: 1) -2,3 4c; 2) -0,9b (-0,6); 3) -5a 3,6b; 4) -8x (-0,5y) 0,6m; 5) -8/21 2 (-m) 7/24; 6) 2 2/7 m (-21/64 n).

Ответ: 1) -9,2c; 2) 0,54b; 3) -18ab; 4) 2,4xуm; 5) 8/3 m; 6) -3/8 mn

1. -2,3 \(\cdot\) 4c = -9,2c
2. -0,9b \(\cdot\) (-0,6) = 0,54b
3. -5a \(\cdot\) 3,6b = -18ab
4. -8x \(\cdot\) (-0,5y) \(\cdot\) 0,6m = 2,4xym
5. -\(\frac{8}{21}\) \(\cdot\) 2 \(\cdot\) (-m) \(\cdot\) \(\frac{7}{24}\) = \(\frac{8}{3}\) m
6. 2 \(\frac{2}{7}\) m \(\cdot\) (-\(\frac{21}{64}\) n) = \(\frac{16}{7}\) m \(\cdot\) (-\(\frac{21}{64}\) n) = -\(\frac{3}{4}\) mn

Ответ: 1) -9,2c; 2) 0,54b; 3) -18ab; 4) 2,4xуm; 5) 8/3 m; 6) -3/8 mn