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Factorization factor A ^ 3-25a
a^3-25a
=a（a²-25）
=a（a-5）（a+5）
Factorization-0.25a ^ 2m ^ 2 + 9
Do you want to present the score,
-0.25a^2m^2+9
=-(0.25a^2m^2-9)
=-(0.5am+3)(0.5am-3)
It's OK not to mention it
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