8) $$(3m^2+7m-4): 2m = \frac{3m^2}{2m} + \frac{7m}{2m} - \frac{4}{2m} = 1.5m + 3.5 - \frac{2}{m}$$
Ответ: $$1.5m + 3.5 - \frac{2}{m}$$