化简5a^2-[a^2+(5a^2-2a)-2(a^2-3a)]

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化简5a^2-[a^2+(5a^2-2a)-2(a^2-3a)]
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化简5a^2-[a^2+(5a^2-2a)-2(a^2-3a)]
化简5a^2-[a^2+(5a^2-2a)-2(a^2-3a)]

化简5a^2-[a^2+(5a^2-2a)-2(a^2-3a)]
5a^2-[a^2+(5a^2-2a)-2(a^2-3a)]
=5a^2-[a^2+5a^2-2a-2a^2+6a]
=5a^2-[4a^2+4a]
=a^2-4a

5a^2-a^2-5a^2+2a+2a^2-3a=a^2-a

5a^2-[a^2+(5a^2-2a)-2(a^2-3a)]
=5a^2-[a^2+5a^2-2a-2a^2+6a]
=5a^2-[4a^2+4a]
=5a^2-4a^2-4a
=a^2-4a
=a(a-4)