인수분해(Factorization)

• $ma+mb=m(a+b)$

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• $(x+y+z)^3-x^3-y^3-z^3=3(x+y)(y+z)(z+x)$

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• $a^4+b^4+c^4-2a^2b^2-2b^2c^2-2c^2a^2=-(a+b+c)(-a+b+c)(a-b+c)(a+b-c)$

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