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
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