当2m+3n/m-n=4时,求2m+3n/2m-2n+3m-3n/2m+3n的值
问题描述:
当2m+3n/m-n=4时,求2m+3n/2m-2n+3m-3n/2m+3n的值
答
取x=2m+3n/m-n,则2m+3n/2m-2n=1/2x,3m-3n/2m+3n=3/x
故其值为2.75