(a-2b)(a+2b)(a²+4b²)-(2a+3b)(2a-3b)(4a²+9b²),其中a=1,b=-1,

问题描述:

(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)=(a²-4b²)(a²+4b²)-(4a²-9b²)(4a²+9b²)=a^4-16b^4-16a^4+81b^4=-15a^4-16b^4+81b^...