若多项式2mx^2-x^2+5x+8-(7x^2-3y+5x)与x无关,求m^2-(2m^2-(5m-4)+m)的值

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若多项式2mx^2-x^2+5x+8-(7x^2-3y+5x)与x无关,求m^2-(2m^2-(5m-4)+m)的值
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若多项式2mx^2-x^2+5x+8-(7x^2-3y+5x)与x无关,求m^2-(2m^2-(5m-4)+m)的值
若多项式2mx^2-x^2+5x+8-(7x^2-3y+5x)与x无关,求m^2-(2m^2-(5m-4)+m)的值

若多项式2mx^2-x^2+5x+8-(7x^2-3y+5x)与x无关,求m^2-(2m^2-(5m-4)+m)的值
多项式2mx^2-x^2+5x+8-(7x^2-3y+5x)=(2m-1-7)x^2+8+3y
因为此式与x无关,所以可知x^2项的系数为0,即2m-1-7=0,所以m=4
所以m^2-(2m^2-(5m-4)+m)=-m^2+4m-4=-16+16-4=-4

值为-4