=(16x^4)²-81² =(2x)^8-6561为什么
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=(16x^4)²-81² =(2x)^8-6561为什么
=(16x^4)²-81² =(2x)^8-6561
为什么
=(16x^4)²-81² =(2x)^8-6561为什么
16=2^4,81² =6561
(16x^4)²-81² =((2x)^4)²-6561=(2x)^8-6561