(x一1)(x2十x)十(x十1)(x2十x十1)等于多少?

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(x一1)(x2十x)十(x十1)(x2十x十1)等于多少?

(x一1)(x2十x)十(x十1)(x2十x十1)等于多少?
(x一1)(x2十x)十(x十1)(x2十x十1)等于多少?

(x一1)(x2十x)十(x十1)(x2十x十1)等于多少?
(x一1)(x2十x)十(x十1)(x2十x十1)
=(x一1)x(x十1)十(x十1)(x2十x十1)
=(x+1)[(x-1)x+x2十x十1]
=(x+1)(x2-x+x2+x+1)
=(x+1)(2x2+1)

(x一1)(x2十x)十(x十1)(x2十x十1)
=(x-1)(x+1)x+(x+1)(x+1)x+(x+1)
=(x+1)(x^2-x+x^2+x+1)
=(x+1)(2x^2+1)