1/2m-2(m-1/3n^2)-(3/2m-1/3n^2)其中M=1/3 N=-1先化简 再求值1/2m-2(m-1/3n^2)-(3/2m-1/3n^2)其中M=1/3 N=-1

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1/2m-2(m-1/3n^2)-(3/2m-1/3n^2)其中M=1/3 N=-1先化简 再求值1/2m-2(m-1/3n^2)-(3/2m-1/3n^2)其中M=1/3 N=-1

1/2m-2(m-1/3n^2)-(3/2m-1/3n^2)其中M=1/3 N=-1先化简 再求值1/2m-2(m-1/3n^2)-(3/2m-1/3n^2)其中M=1/3 N=-1
1/2m-2(m-1/3n^2)-(3/2m-1/3n^2)其中M=1/3 N=-1
先化简 再求值
1/2m-2(m-1/3n^2)-(3/2m-1/3n^2)其中M=1/3 N=-1

1/2m-2(m-1/3n^2)-(3/2m-1/3n^2)其中M=1/3 N=-1先化简 再求值1/2m-2(m-1/3n^2)-(3/2m-1/3n^2)其中M=1/3 N=-1
1/2m-2(m-1/3n^2)-(3/2m-1/3n^2)
=1/2m-2m+2/3n²-3/2m+1/3n²
=-3m+n²
当m=1/3,n=-1
∴原式=-1+1=0