因式分解(公式法完全平方公式)(维文)ppt课件.ppt

15-4-2. , ,1. 169- 2. 170- 1- 2- ., , () , ( ) ( ) 2 ., :, () ,a2y，b1,a2y，b3x,a (a+b)，b1, :, , ., :16x2=(4x)2 9=32 24x=24x3 16x2+24x+9 .: 16x2+24x+9= (4x)2+ 24x3 +32, : 16x2+24x+9,a2,2,a,b,b2,+,+,:(1)16x2+24x+9 =(4x)2+24x3+32 =(4x+3)2.,: :(1) x2+4xy4y2,= (x2-4xy+4y2),(2) 3ax2+6axy+3ay2; (3) (a+b)2-12(a+b)+36., -:,(1) ,(2) - :( : )( : ),(1),:,(2),(3),(4),(3) a3-8a2+16a (4) 4x2(b-c) +y2(c-b),9x2+mx+16 : m= _4x2-12xy+m : m= _,24,9y2,a(a-4)2,(b-c)(2x+y)(2x-y),(5)-a2-10a -25,-(a+5)2, :,(2)9 - 12(a-b) + 4 (a-b)2,(1)-a3b3+2a2b3-ab3,(3)16x4-8x21,(4)(y2 + x2 )2 - 4x2y2,(5)(a+b)22(a+b)(a-b)(a-b)2,(1) 9x2+24x+16; (2) y2-4xy4x2.,(3) 4mnx2-8mnxy+4mny2; (4) (a-b)2- (a-b)+0.25., :,