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(x-2y)²;(x+2y)²;=[(x-2y)(x+2y)]²;=(x²;-4y²;)²;=x的4次方-8x²;y²;+y的4次方(a-2b+3)(a+2b-3)=[a-(2b-3)][a+(2b-3)]=a²;-(2b-3)²;=a²;-4b²;+12b-9很高興為您解答,…
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