若2mx²-x²+5x+8-(7x²-3y+5x)的值与x无关,求m²-【2m&
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若2mx²-x²+5x+8-(7x²-3y+5x)的值与x无关,求m²-【2m²-(5m-4)+m】的值.
![若2mx²-x²+5x+8-(7x²-3y+5x)的值与x无关,求m²-【2m&](/uploads/image/z/18639792-0-2.jpg?t=%E8%8B%A52mx%26sup2%3B-x%26sup2%3B%2B5x%2B8-%287x%26sup2%3B-3y%2B5x%29%E7%9A%84%E5%80%BC%E4%B8%8Ex%E6%97%A0%E5%85%B3%2C%E6%B1%82m%26sup2%3B-%E3%80%902m%26)
若2mx²-x²+5x+8-(7x²-3y+5x)的值与x无关,求m²-【2m²-(5m-4)+m】的值.
根据题意,化简2mx²-x²+5x+8-(7x²-3y+5x)得
(2m-8)x²+8-3y
因为2mx²-x²+5x+8-(7x²-3y+5x)的值与x无关,所以2m-8=0
则m=4
m²-【2m²-(5m-4)+m】=-(m-2)^2
代入得-(m-2)^2=4
根据题意,化简2mx²-x²+5x+8-(7x²-3y+5x)得
(2m-8)x²+8-3y
因为2mx²-x²+5x+8-(7x²-3y+5x)的值与x无关,所以2m-8=0
则m=4
m²-【2m²-(5m-4)+m】=-(m-2)^2
代入得-(m-2)^2=4
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