当m=-1时,-2m²-[-4m²+(-m²)]等于,数学题···

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当m=-1时,-2m²-[-4m²+(-m²)]等于,数学题···
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当m=-1时,-2m²-[-4m²+(-m²)]等于,数学题···
当m=-1时,-2m²-[-4m²+(-m²)]等于,数学题···

当m=-1时,-2m²-[-4m²+(-m²)]等于,数学题···
-2m²-[-4m²+(-m²)]
=-2m²+4m²+m²
=-2m²+5m²
=3m²
=3×(-1)²
=3×1
=3

m=-1,m²=1
-2m²-[-4m²+(-m²)]
=-2-(-4-1)
=-2-(-5)
=3