(2n方+2n+1)平方

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(2n方+2n+1)平方(2n方+2n+1)平方(2n方+2n+1)平方(2n^2+2n+1)^2=[2n^2+(2n+1)]^2=4n^4+4n^2*(2n+1)+(2n+1)^2=4n^4+8n^

(2n方+2n+1)平方
(2n方+2n+1)平方

(2n方+2n+1)平方
(2n^2+2n+1)^2=[2n^2+(2n+1)]^2
=4n^4+4n^2*(2n+1)+(2n+1)^2
=4n^4+8n^3+4n^2+4n^2+4n+1
=4n^4+8n^3+8n^2+4n+1