K) 39⋅123119​−37⋅123119​ M) 25922 17+61+6117 813⋅42−42⋅713 П) 8-43-43⋅716

Решение:

К) $$39 \cdot \frac{119}{123} - 37 \cdot \frac{119}{123} = \frac{119}{123} \cdot (39 - 37) = \frac{119}{123} \cdot 2 = \frac{238}{123}$$

M) $$\frac{2}{17} \cdot \frac{59}{61} + \frac{2}{61} \cdot \frac{2}{17} = \frac{2}{17} \cdot (\frac{59}{61} + \frac{2}{61}) = \frac{2}{17} \cdot \frac{61}{61} = \frac{2}{17} \cdot 1 = \frac{2}{17}$$

П) $$8\frac{13}{16} \cdot 4\frac{2}{3} - 4\frac{2}{3} \cdot 7\frac{13}{16} = 4\frac{2}{3} \cdot (8\frac{13}{16} - 7\frac{13}{16}) = \frac{14}{3} \cdot (8\frac{13}{16} - 7\frac{13}{16}) = \frac{14}{3} \cdot 1 = \frac{14}{3} = 4\frac{2}{3}$$

Ответ: Смотри решение выше