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《习题训练》新课标PPT课件优质课下载
a2 ±2ab+b2=(a ±b)2
(4) 3ax2+6ax+3a
(3) x5 - x3
(1) x4 - y4
(2) (y2 + x2 )2 - 4x2y2
(5) 2ax2+6ax+4a
3.把下列各式因式分解:
解:(1) x4 - y4=(x2+y2)(x2-y2) = (x2+y2)(x+y)(x-y)
(2) (y2 + x2 )2 - 4x2y2
=(y2 + x2 +2xy) (y2 + x2 -2xy)
=(x+y)2(x-y)2
(3) x5 - x3=x3(x2-1)=x3(x+1)(x-1)
(4) 3ax2+6ax+3a=3a(x2+2x+1)
=3a(x+1)2
(5) 2ax2+6ax+4a=2a(x2+3x+2)
1.(x+2)(x+1)=
x2+3x+2
3.(x-2)(x+1)=
x2-x-2
4.(x-2)(x-1)=
x2-3x+2
2.(x+2)(x-1)=
x2+x-2
5.(x+2)(x+3)=