应该是m³+2m²+2012=?吧···m²+m-1=0,所以m²+m=1.m³+2m²+2012=m×(m²+m)+m²+2012=m×1+m²+2012=1+2012=2013.这是一道老题,百度一下m²+m-1=0就知道了....