初二数学（1）若2x-y=0,求4x³+2xy(x - 知识问答

初二数学（1）若2x-y=0,求4x³+2xy(x+y)+y的值 2）若m²+m-1=0,求m

3个回答

(1).2x-y=0 y=2x (2).m²+m-1=0 m²+m=1 m(m+1)=1
4x³+2xy(x+y)+y m³+2m²+2008
=4x³+2x×2x(x+2x)+2x =m²(m+1)+m²+2008
=4x³+12x³+2x =m+m²+2008
=16x³+2x =1+2008
=2009

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