(x²-1)²+6(x²-1)+9这道题怎么分解因式,
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(x²-1)²+6(x²-1)+9这道题怎么分解因式,
(x²-1)²+6(x²-1)+9这道题怎么分解因式,
(x²-1)²+6(x²-1)+9这道题怎么分解因式,
(x²-1)²+6(x²-1)+9
=[(x²-1)+3]²
=(x²-1+3)²
=(x²+2)²