a-2b)(a+2b)(a²+4b²)-(2a+3b)(2a-3b)(4a²+9b²),其中a=1,b=-1
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a-2b)(a+2b)(a²+4b²)-(2a+3b)(2a-3b)(4a²+9b²),其中a=1,b=-1
a-2b)(a+2b)(a²+4b²)-(2a+3b)(2a-3b)(4a²+9b²),其中a=1,b=-1
a-2b)(a+2b)(a²+4b²)-(2a+3b)(2a-3b)(4a²+9b²),其中a=1,b=-1
(a-2b)(a+2b)(a²+4b²)-(2a+3b)(2a-3b)(4a²+9b²),其中a=1,b=-1
=(a²-4b²)(a²+4b²)-(4a²-9b²)(4a²+9b²)
=a^4-16b^4-16a^4+81b^4
=-15a^4+65b^4
=-15+65
=50