因式分解 :﹙1﹚x²-4y²+x-2y ﹙2﹚4a²-﹙a²+1﹚²

问题描述:

因式分解 :﹙1﹚x²-4y²+x-2y ﹙2﹚4a²-﹙a²+1﹚²

(1)原式=(x²-4y²)+(x-2y)
=(x+2y)(x-2y)+(x-2y)
=(x+2y+1)(x-2y)
(2)原式=(2a+a²+1)(2a-a²-1)
=-(a²+2a+1)(a²-2a+1)
=-(a+1)²(a-1)²

(1),原式=(x+2y)(x-2y)+(x-2y)=(x-2y)(x+2y+1)
(2),原式=[2a-(a^2+1)][2a+(a^2+1)]=-[a^2-2a+1][a^2+2a+1]=-(a-1)^2(a+1)^2

﹙1﹚x²-4y²+x-2y =(x²-4y²)+(x-2y ) =(x+2y )(x-2y )+(x-2y ) =(x-2y )(x+2y +1)﹙2﹚4a²-﹙a²+1﹚² =(2a)²-﹙a²+1﹚...

2.原式=(2A+A+1)(2A-A-1)=(3A+1)(A-1)