[tex]\displaystyle\bf\\\frac{0,005\cdot0,081\cdot 3,2}{0,09\cdot0,0025\cdot 6,4} =\frac{0,005\cdot0,09\cdot 0,9\cdot 3,2}{0,09\cdot 0,005\cdot 0,5\cdot 3,2\cdot 2} =\\\\\\=\frac{0,9}{0,5\cdot 2} =\frac{0,9}{1} =0,9\\\\\\Otvet \ : \ C[/tex]