是要分解因式吗?
m^2-n^2+3m-3n=（m+n）*（m-n）+3（m-n）=(m-n)*(m+n+3).
x^2-5x-6 =（x-6）*（x+1）
m^2-n^2+3m-3n x^2-5x-6 m^2-n^2+3m-3n
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