1除以m平方-m+m-5除以2m平方-2 等于几?求个公式

=1/m(m-1)+(m-5)/2(m+1)(m-1)
=[2(m+1)+m(m-5)]/[2m(m+1)(m-1)]
=(m²-3m+2)/[2m(m+1)(m-1)]
=(m-1)(m-2)/[2m(m+1)(m-1)]
=(m-2)(2m²+2m)