若|m+1/3|+(n-1/2)^2=0,求多项式m^2+2m^3n+n^2-2m^2-2m^3n+3n^2的值

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若|m+1/3|+(n-1/2)^2=0,求多项式m^2+2m^3n+n^2-2m^2-2m^3n+3n^2的值若|m+1/3|+(n-1/2)^2=0,求多项式m^2+2m^3n+n^2-2m^2-

若|m+1/3|+(n-1/2)^2=0,求多项式m^2+2m^3n+n^2-2m^2-2m^3n+3n^2的值
若|m+1/3|+(n-1/2)^2=0,求多项式m^2+2m^3n+n^2-2m^2-2m^3n+3n^2的值

若|m+1/3|+(n-1/2)^2=0,求多项式m^2+2m^3n+n^2-2m^2-2m^3n+3n^2的值
绝对值和平方都大于等于0
相加等于0,若有一个大于0,则另一个小于0,不成立.
所以两个都等于0
所以m+1/3=0,n-1/2=0
m=-1/3,n=1/2
m^2+2m^3n+n^2-2m^2-2m^3n+3n^2
=-m^2+4n^2
=-1/9+1
=8/9