关于x,y的多项式6mx²+4nxy+2x+2xy-x²+y+4不含二次项,求多项式2m²n+10m-4n+2-2m²n-4m+2n的值.
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关于x,y的多项式6mx²+4nxy+2x+2xy-x²+y+4不含二次项,求多项式2m²n+10m-4n+2-2m²n-4m+2n的值.
关于x,y的多项式6mx²+4nxy+2x+2xy-x²+y+4不含二次项,求多项式2m²n+10m-4n+2-2m²n-4m+2n的值.
关于x,y的多项式6mx²+4nxy+2x+2xy-x²+y+4不含二次项,求多项式2m²n+10m-4n+2-2m²n-4m+2n的值.
依题目意得
6m=1
4n=-2,即2n=-1
2m²n+10m-4n+2-2m²n-4m+2n
=6m-2n
=1-(-1)
=2
不含二次项的意思是原式中的未知数平方可以消去,你找对应的二次项互相去掉x平方,相加等于0解出mn常数值,带入后式就可以了