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关于X,Y的多项式6mx²+4nxy+2+2xy-x²+y+4不含二次项
关于X,Y的多项式6mx²+4nxy+2+2xy-x²+y+4不含二次项,求多项式2m²n+10m-4n+2-2m²n-4m+2n...
关于X,Y的多项式6mx²+4nxy+2+2xy-x²+y+4不含二次项,求多项式2m²n+10m-4n+2-2m²n-4m+2n
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3个回答
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首先把多项式合并
(6m-1)x^2+(4n+2)xy+y+6
所以
6m-1=0
4n+2=0
解得m=1/6,n=-1/2
2m²n+10m-4n+2-2m²n-4m+2n
=6m-2n+2
=1+1+2
=4
(6m-1)x^2+(4n+2)xy+y+6
所以
6m-1=0
4n+2=0
解得m=1/6,n=-1/2
2m²n+10m-4n+2-2m²n-4m+2n
=6m-2n+2
=1+1+2
=4
更多追问追答
追问
为什么6m-1=0 4n+2=0?x=?
追答
不含二次项,所以二次项前面的系数为0
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