(m²-1)²-6(m²-1)+9因式分解,求求你,

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(m²-1)²-6(m²-1)+9因式分解,求求你,
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(m²-1)²-6(m²-1)+9因式分解,求求你,
(m²-1)²-6(m²-1)+9因式分解,求求你,

(m²-1)²-6(m²-1)+9因式分解,求求你,
(m²-1)²-6(m²-1)+9
=(m²-1-3)²
=(m²-4)²
=(m-2)²(m+2)²