若m,n互为相反数,a和b互为倒数|m-2+n-ab|= 若m,n互为相反数,a和b互为倒数|m-2+n-ab|=

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若m,n互为相反数,a和b互为倒数|m-2+n-ab|= 若m,n互为相反数,a和b互为倒数|m-2+n-ab|=
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若m,n互为相反数,a和b互为倒数|m-2+n-ab|= 若m,n互为相反数,a和b互为倒数|m-2+n-ab|=
若m,n互为相反数,a和b互为倒数|m-2+n-ab|= 若m,n互为相反数,a和b互为倒数|m-2+n-ab|=

若m,n互为相反数,a和b互为倒数|m-2+n-ab|= 若m,n互为相反数,a和b互为倒数|m-2+n-ab|=
|m-2+n-ab|=|(m+n)+2-ab|=|0+2-1|=1

|m-2+n-ab|=3
m+n=0
ab=1
-2=-2
-2-1+0=-3
- -3=3