化简m的平方-4分之2m-m-2分之m

问题描述:

化简m的平方-4分之2m-m-2分之m

原式=2m/(m+2)(m-2)-(m+2)/(m+2)(m-2)
=(2m-m-2)/(m+2)(m-2)
=(m-2)/(m+2)(m-2)
=1/(m+2)