化简5(a^2-2)-2(a^2+3a+1)+3(4-a^2+3a)

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化简5(a^2-2)-2(a^2+3a+1)+3(4-a^2+3a)
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化简5(a^2-2)-2(a^2+3a+1)+3(4-a^2+3a)
化简5(a^2-2)-2(a^2+3a+1)+3(4-a^2+3a)

化简5(a^2-2)-2(a^2+3a+1)+3(4-a^2+3a)
5(a^2-2)-2(a^2+3a+1)+3(4-a^2+3a)
=5a^2-10-2a^2-6a-2+12-3a^2+9a
=(5a^2-2a^2-3a^2)-(10+2-12)-(6a-9a)
=0-0-(-3a)
=3a

5(a^2-2)-2(a^2+3a+1)+3(4-a^2+3a)
=5a^2-10-2a^2-6a-2+12-3a^2+9a
=(5a^2-2a^2-3a^2)+((-6a+9a)+(-10-2+12)
=3a