已知a>b>0,c

问题描述:

已知a>b>0,c

证明:
m/(a-c)-m/(b-d)
=m[1/(a-c)-1/(b-d)]
=m[(b-d-a+c)/(a-c)(b-d)]
=m[(b-a+c-d)/(a-c)(b-d)]
∵a>b>0,c