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初二数学(1)若2x-y=0,求4x³+2xy(x+y)+y的值 2)若m²+m-1=0,求m³+2m²+2008的值
人气:122 ℃ 时间:2020-01-31 11:46:05
解答
(1).2x-y=0 y=2x (2).m²+m-1=0m²+m=1 m(m+1)=1 4x³+2xy(x+y)+y m³+2m²+2008=4x³+2x×2x(x+2x)+2x=m²(m+1)+m²+...
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