(x+1)²(x-1)²
=[(x+1)(x-1)]²
=(x²-1)²
=x的4次方-2x²+1
(a-2b)(a+2b)(a²-4b²)
=(a²-4b²)(a²-4b²)
=(a²-4b²)²
=a的4次方-8a²b²+16b的4次方
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