1) 0.3a * 1.2 = 0.36a. Если a = 0.05, то 0.36 * 0.05 = 0.018.
2) 2.5m * 0.04n = 0.1mn. Если m = -3, n = 3.2, то 0.1 * (-3) * 3.2 = -0.96.
3) 7.9x + 2.1x = 10x. Если x = 1.65, то 10 * 1.65 = 16.5.
4) 1.2m + 3.9m - 2.1m + 1.8 = (1.2 + 3.9 - 2.1)m + 1.8 = 3m + 1.8. Если m = 0.9, то 3 * 0.9 + 1.8 = 2.7 + 1.8 = 4.5.