Відповідь:

1)

[tex](-\frac{1}{2}m^{3} )(16m^{2} )\\-\frac{1}{2} m^{3} * 16m^{2}\\ -m^{3} * 8m^{2} \\-8m^{5}[/tex]

2)

[tex](\frac{3}{4} x^{2} y^{3}z )*(\frac{2}{3} x^{3} y^{2} z^{2} )\\\frac{3}{4} x^{2} y^{3} z*\frac{2}{3} x^{3} y^{2} z^{2} \\\frac{1}{2} x^{2} y^{3} z*x^{3} y^{2} z^{2} \\\frac{x}{y} x^{5} y^{5} z^{3}[/tex]

3)

[tex](-\frac{3}{5} a^{2} x y^{3} )(\frac{2}{3} a x^{2} y )\\-\frac{3}{5} a^{2} x y^{3} *\frac{2}{3} a x^{2} y\\-\frac{1}{5} a^{2} x y^{3} *2 a x^{2} y\\-\frac{2}{5} a^{2} x y^{3} * a x^{2} y\\-\frac{2}{5} a^{3} x^{3} y^{4}[/tex]

4)

[tex](10\frac{1}{3} * ab^{2} c^{4} )(1\frac{5}{31} *a^{7}b c^{2} )\\10\frac{1}{3} * ab^{2} c^{4} * 1\frac{5}{31} *a^{7}b c^{2}\\\frac{31}{3} * ab^{2} c^{4} * \frac{36}{31} *a^{7}b c^{2}\\\frac{1}{3} * ab^{2} c^{4} * 36 *a^{7}b c^{2}\\\frac{36}{3} * ab^{2} c^{4} *a^{7}b c^{2}\\12 * ab^{2} c^{4} *a^{7}b c^{2}\\12 a^{8} b^{3} c^{6}[/tex]