(-4) \(\cdot\) (36 + 89) =
36 + 89 = 125
-4 \(\cdot\) 125 = -500
Ответ: -500
(\[ \frac{4}{6} - \frac{1}{3} \] ) \(\cdot\) \frac{3}{5} =
\[ \frac{4}{6} - \frac{1}{3} = \frac{4}{6} - \frac{1 \(\cdot\) 2}{3 \(\cdot\) 2} = \frac{4}{6} - \frac{2}{6} = \frac{4-2}{6} = \frac{2}{6} \]
\[ \frac{2}{6} = \frac{1}{3} \]
\[ \frac{1}{3} \cdot \frac{3}{5} = \frac{1 \cdot 3}{3 \cdot 5} = \frac{3}{15} \]
\[ \frac{3}{15} = \frac{1}{5} \]
Ответ: \(\frac{1}{5}\) или 0.2
1.62 + 0.8 \(\cdot\) 1.75 - 1.3 =
0.8 \(\cdot\) 1.75 = 1.4
1.62 + 1.4 = 3.02
3.02 - 1.3 = 1.72
Ответ: 1.72