已知|m-1/2|=0,求代数式4m^2-{6m-2(3m+2)-2m^2}的值

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已知|m-1/2|=0,求代数式4m^2-{6m-2(3m+2)-2m^2}的值

已知|m-1/2|=0,求代数式4m^2-{6m-2(3m+2)-2m^2}的值
已知|m-1/2|=0,求代数式4m^2-{6m-2(3m+2)-2m^2}的值

已知|m-1/2|=0,求代数式4m^2-{6m-2(3m+2)-2m^2}的值
因为|m-1/2|=0
所以 m =1/2
把m=1/2带入代数式4m^2-{6m-2(3m+2)-2m^2},得:
4×1/2^2-{6×1/2-2(3×1/2+2)-2×1/2^2}
=1-{3-7-1/2}
=1-3+7+1/2
=-2+7+1/2
=5+1/2
=五又二分之一

因为|m-1/2|=0
所以 m =1/2
把m=1/2带入 代数式4m^2-{6m-2(3m+2)-2m^2},得; 4×1/2^2-{6×1/2-2(3×1/2+2)-2×1/2^2}
=1-{3-7-1/2}
=1-3+7+1/2
=-2+7+1/2
=5+1/2
=11/2