(x²-4)²-10(x²-4)+25

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(x²-4)²-10(x²-4)+25
(x²-4)²-10(x²-4)+25

(x²-4)²-10(x²-4)+25
原式＝[(x²-4)-5]²
=(x²-9)²
=[(x+3)(x-3)]²
=(x+3)²(x-3)²