计算:(1)(a-1)(a+1)(a平方+1) (2)(2a-3b)(2a+3b)(4a平方-9b平方)
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计算:(1)(a-1)(a+1)(a平方+1) (2)(2a-3b)(2a+3b)(4a平方-9b平方)
计算:(1)(a-1)(a+1)(a平方+1) (2)(2a-3b)(2a+3b)(4a平方-9b平方)
计算:(1)(a-1)(a+1)(a平方+1) (2)(2a-3b)(2a+3b)(4a平方-9b平方)
:(1)(a-1)(a+1)(a平方+1)
=(a²-1)(a²+1)
=a^4-1
(2)(2a-3b)(2a+3b)(4a平方-9b平方)
=(4a²-9b²)(4a²-9b²)
=16a^4-72a²b²+81b^4
(1)(a平方-1)(a平方+1) a四次方-1