(1-3a)(1+3a)(1+9^2)(1+81a^4),其中a=-1/2

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(1-3a)(1+3a)(1+9^2)(1+81a^4),其中a=-1/2(1-3a)(1+3a)(1+9^2)(1+81a^4),其中a=-1/2(1-3a)(1+3a)(1+9^2)(1+81a^

(1-3a)(1+3a)(1+9^2)(1+81a^4),其中a=-1/2
(1-3a)(1+3a)(1+9^2)(1+81a^4),其中a=-1/2

(1-3a)(1+3a)(1+9^2)(1+81a^4),其中a=-1/2
(1-3a)(1+3a)(1+9a^2)(1+81a^4),
=(1-9a^2)(1+9a^2)(1+81a^4)
=(1-81a^4)(1+81a^4)
=1-81²a^8
=1-6561/256
=-6305/256

其中a=-1/2
(1-3a)(1+3a)(1+9[a]^2)(1+81a^4)
=(1-9[a]^2)(1+9[a]^2)(1+81a^4)
=(1-81a^4)(1+81a^4)
=1-81*81a^8
=1-(3/2)^8
=1-6561/256
=-6305/256