1、(x-3)^2-2(x-3)
=(x-3)*(x-3)-2(x-3)
=(x-3)(x-3-2)
=(x-3)(x-5)
2、m^4-16n^4
=(m^2)^2-(4(n^2))^2
=(m^2+4(n^2))(m^2-4(n^2))
=(m^2+4(n^2))(m+2n)(m-2n)
（x-3）^2-2(x-3)=(x-3)[(x-3)-2]=(x-3)(x-5)
m^4-16n^4=(m^2+4n^2)(m^2-4n^2)=(m^2+4n^2)(m+2n)(m-2n)
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