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x2+ 1 x2+2x-1 x2+x+1 x2+4x+4
X1 X2
(Xl,X2) (Xl,X2,X3,X4)
X1 X2 (X1,X2) (X1,X2,X3,X4)
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)
x2﹣1 x(x﹣2)+(2﹣x) x2﹣2x+1 x2+2x+1
X1 X2 (X1,X2) (X1,X2,X3,X4)
x2+1 x2+2x﹣1 x2+x+1 x2+4x+4
x(2x+1)(2x-1) x(4x+1)(4x-1) x(2x-1)2 x(4x2-1)
(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)