Question

m-m²/（m²-1)÷m/（m-1）x(m+1）/（m-1）²

Answer 1

/>原式

=-m(m-1)/(m+1)(m-1) × (m-1)/m x(m+1）/（m-1）²

=-m/(m+1) ×(m-1)/m x(m+1）/（m-1）²

=-m/(m+1)×(m-1)/m x(m+1）/（m-1）²

=-1/(m-1)

=1/(1-m)

图片格式