若m,n互为相反数,求3m-{3n-[n-(4m-3n)-1]-2m}的值
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若m,n互为相反数,求3m-{3n-[n-(4m-3n)-1]-2m}的值
若m,n互为相反数,求3m-{3n-[n-(4m-3n)-1]-2m}的值
若m,n互为相反数,求3m-{3n-[n-(4m-3n)-1]-2m}的值
m=-n;
3m-{3n-[n-(4m-3n)-1]-2m}
=3m-3n+[n-(4m-3n)-1]+2m
=3m-3n+n-(4m-3n)-1+2m
=3m-3n+n-4m+3n-1+2m
=m+n-1
=-1
-1
数学已经全部还给数学老师了~~~
m=-n;
3m-{3n-[n-(4m-3n)-1]-2m}
=3m-3n+[n-(4m-3n)-1]+2m
=3m-3n+n-(4m-3n)-1+2m
=3m-3n+n-4m+3n-1+2m
=m+n-1
=-1
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