[(x+3y)(x-3y)]的二次方

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[(x+3y)(x-3y)]的二次方[(x+3y)(x-3y)]的二次方[(x+3y)(x-3y)]的二次方原式=(X²-9Y²)²=(X²)²-2×

[(x+3y)(x-3y)]的二次方
[(x+3y)(x-3y)]的二次方

[(x+3y)(x-3y)]的二次方
原式=(X²-9Y²)²
=(X²)²-2×X²×9Y²+(9Y²)²
=X^4-18X²Y²+81Y^4