化简 (m²-1)÷(m+1)-(m²-m³)÷(m²-m)

问题描述:

化简 (m²-1)÷(m+1)-(m²-m³)÷(m²-m)

(m+1)(m-1)÷(m+1)-m²(1-m)÷m(m-1)
=(m-1)+m
=m-1+m
=2m-1