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X1 X2
(Xl,X2) (Xl,X2,X3,X4)
X1 X2 (X1,X2) (X1,X2,X3,X4)
)(x+2)(x–2)=x2-4( )x2-4+3x=(x+2)(x–2)+3x ( )x2-3x-4=(x-4)(x+1)( )x2+2x-3=(x+1)2-4
x2﹣4=(x+4)(x﹣4) x2+x+1=(x+1)2 x2﹣2x﹣3=(x﹣1)2﹣4 2x+4=2(x+2)
(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)
X1 X2 (X1,X2) (X1,X2,X3,X4)
4-x2+3x=(2-x)(2+x)+3x -x2+3x+4=-(x+4)(x-1) 1-4x+4x2=(1-2x)2 x2y-xy+x3y=x(xy-y+x2y)
X1 X2 (X1,X2) (X1,X2,X3,X4)
x(2x+1)(2x-1) x(4x+1)(4x-1) x(2x-1)2 x(4x2-1)
x2﹣4=(x+4)(x﹣4) x2+2x+1=x(x+2)+1 3mx﹣6my=3m(x﹣6y) 2x+4=2(x+2)
x2+3x+2=x(x+3)+2 4x2﹣9=(4x+3)(4x﹣3) x2﹣5x+6=(x﹣2)(x﹣3) a2﹣2a+1=(a+1)2
(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
(x-1)(x-2)=x2-3x+2 x2-3x+2=(x-1)(x-2) x2+4x+4=x(x一4)+4 x2+y2=(x+y)(x―y)
X1 X2 (Xl,X2) (Xl,X2,X3,X4)