Question

помогите пожалуйста ​

Answer 1

$\displaystyle\bf\\1)\\\\\frac{3m-1}{m+2} -\frac{3m+1}{m-2} =\frac{(3m-1)\cdot(m-2)-(3m+1)\cdot(m+2)}{(m+2)(m-2)}=\\\\\\=\frac{3m^{2} -6m-m+2-3m^{2} -6m-m-2 }{(m+2)(m-2)} =\\\\\\=\frac{-14m}{m^{2} -4} =\frac{14m}{4-m^{2} } \\\\\\2)\\\\\frac{14m}{4-m^{2} } :\frac{21m}{4-m^{2} } =\frac{14m}{4-m^{2} } \cdot\frac{4-m^{2} }{21m} =\frac{2}{3}$