若m，n互为相反数，且m，n均不为0，x，y互为倒数，则mxy+n+5xy-m/n=???

Question

如题所述

Answer 1

根据题意
m+n=0
xy=1
mxy+n+5xy-m/n=m+n+5-m/n=5-（-1）=6
互为相反数的两个数的商=-1

Answer 2

6 易得xy=1 ,m+n= 0 ,m=-n,原式为m+n+5-m/n,整理为6.