当m=1时,-2m^2-【-4m^2+(-m^2)】的值为
问题描述：
当m=1时,-2m^2-【-4m^2+(-m^2)】的值为
答
-2m^2-【-4m^2+(-m^2)】
=-2m²+4m²+m²
=3m²
=3x1²
=3