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
问题描述:
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
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...