当a和b互为倒数,m和n互为相反数,则5m+5n+0.5ab=?

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当a和b互为倒数,m和n互为相反数,则5m+5n+0.5ab=?当a和b互为倒数,m和n互为相反数,则5m+5n+0.5ab=?当a和b互为倒数,m和n互为相反数,则5m+5n+0.5ab=?a和b互

当a和b互为倒数,m和n互为相反数,则5m+5n+0.5ab=?
当a和b互为倒数,m和n互为相反数,则5m+5n+0.5ab=?

当a和b互为倒数,m和n互为相反数,则5m+5n+0.5ab=?
a和b互为倒数,m和n互为相反数,
则ab=1 m+n=0
5m+5n+0.5ab
=5(m+n)+0.5ab
=0+0.5
=0.5

0.5

a和b互为倒数,m和n互为相反数
ab=1 m+n=0
则5m+5n+0.5ab
=5(m+n)+0.5ab
=5*0+0.5*1
=0.5

a=1/b a*b=1
m=-n m+n=0
5m+5n+0.5ab=5(m+n)+0.5ab=5*0+0.5*1=0.5

原式=5X(m+n)+0.5X(ab)=5X0+0.5X1=0.5
互为相反数相加为0,互为倒数相乘为1