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x(a-b)=ax-bx x2-1+y2=(x-1)(x+1)+y2 x2-1=(x+1)(x-1) ax+bx+c=x(a+b)+c
(x+1)(x-1)=x2-1 x2-y2+3=(x+y)(x-y)+3 a2-4=(a-2)2 x2y-xy+x3y=xy(x-1+x2)
(x+2)(x-2)=x2-4 x2-4y2=(x-2y)(x+2y) x2-4+3x=(x+2)(x-2)+3x 2a(b+c)-3(b+c)=2ab+2ac-3b-3c
(x+1)(x﹣1)=x2﹣1 x2﹣4x+4=x(x﹣4)+4 (x+3)(x﹣4)=x2﹣x﹣12 x4﹣16=(x2+4)(x+2)(x﹣2)
①直接开平方法,②配方法,③公式法,④因式分解法 ①直接开平方法,②公式法,③、④因式分解法 ①因式分解法,②公式法,③配方法,④因式分解法 ①直接开平方法,②、③公式法,④因式分解法
x2﹣1 x2+2x﹣1 x2+x+1 4x2+4x+1
x2﹣9+6x=(x+3)(x﹣3)+6x (x+5)(x﹣2)=x2+3x﹣10 x2﹣8x+16=(x﹣4)2 6ab=2a•3b
(3x+1)(3x-1)=9x2-1 x2-2x+4=(x-2)2 a4-1=(a2+1)(a+1)(a-1) 9x2-1+3x=(3x+1)(3x-1)+3x
a(x+y)=ax+ay; x2-4x+4=x(x-4)+4; 10x2-5x=5x(2x-1); x2-16+3x=(x+4)(x-4)+3x
a(x+y)=ax+ay x2-4x+4=x(x-4)+4 10x2-5x=5x(2x-1) x2-16+6x=(x+4)(x-4)+6x
x2+x+1 x2+2x-1 x2-1 x2-6x+9
(a+1)(a-1)=a2-1 a2-6a+9=(a-3)2 x2+2x+1=x(x+2x)+1 -18x4y3=-6x2y2·3x2y
(y﹣1)(y+1)=y2﹣1 x2y+xy2﹣1=xy(x+y)﹣1 (x﹣2)(x﹣3)=(3﹣x)(2﹣x) x2﹣4x+4=(x﹣2)2