(x²-6x)²+(18x²-6x)+81

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(x²-6x)²+(18x²-6x)+81
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(x²-6x)²+(18x²-6x)+81
(x²-6x)²+(18x²-6x)+81

(x²-6x)²+(18x²-6x)+81
是(x²-6x)²+18(x²-6x)+81
=(x²-6x+9)²
=(x-3)⁴