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数学
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1.m²+m-1=0,求m三次方+2m²=2004 2.a-b=2,a-c=1,求(2a-b-c)²+(c-a)²
人气:118 ℃ 时间:2020-06-20 20:10:56
解答
1. m²+m-1=0,求m三次方+2m²+2004 m三次方+2m²+2004 =m(m²+m)+m²+2004=m+m²+2004=m²+m-1+2005=20052. a-b=2,a-c=1,(2a-b-c)²+(c-a)²=(a-b+a-c)²...
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