若mn互为相反数,且mn均不为0,xy互为倒数,求mxy+n+5xy的值

问题描述:

若mn互为相反数,且mn均不为0,xy互为倒数,求mxy+n+5xy的值

若mn互为相反数,且mn均不为0,xy互为倒数,
m+n=0
xy=1
mxy+n+5xy
=m*1+n+5*1
=m+n+5
=0+5
=5