|m|+| (2+m-m^2) 除以(m+1) |
=|m|+| (m^2-m-2)/(m+1) |
=|m|+| (m-2)(m+1)/(m+1) |
=|m|+|m-2|
(1)当m>=2
上式=m+m-2=2m-2
(2)当0=|m|+| (m^2-m-2)/(m+1) m^2前负号呢|m|+| (2+m-m^2) 除以(m+1) |=|m|+|- (m^2-m-2)/(m+1) |=|m|+| (m^2-m-2)/(m+1) |=|m|+|2-m|这对吗对的