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(x+1)(x+2)=0 (x+1)(x-2)=0 (x-1)(x-2)=0 (x-1)(x+2)=0
(2x-2)(3x-4)=0,∴2-2x=0或3x-4=0 (x+3)(x-1)=1,∴x+3=0或x-1=1 (x-2)(x-3)=2×3,∴x-2=2或x-3=3 x(x+2)=0,∴x+2=0
(x-1)(x-2) x2 (x+1)2 (x-2)2
y=(x-2)2+1 y=(x-2)2-1 y=(x-2)2-3 y=(x-2)2+3
(x-1)(x-2) x2 (x+1)2 (x-2)2
(x-1)(x-2) x2 (x+1)2 (x-2)2
5(x-2)+9(x+1)=1 5(x-2)+9(x+1)=15 3(x-2)+9(x+1)=1 3(x-2)+9(x+1)=15
2x-(x-2)=6 2x-x-2=6 2x-(x-2)=1 2x-x-2=1
x=1 x1=0,x2=1 x1=2,x2=-1 x1=2,x2=1
x+2=-1 x+2(x-2)=1 x+2(x-2)=-1 x+2=1
{x| x<-2或x>1} {x| -2 {x| x<-1或x>2} {x| -1
-x2+(-2)2=(x-2)(x+2) x2+2x-1=(x-1) 4x2-4x+1=(2x-1)2 x2-4x=x(x+2)(x-2)
x=0 x1=0,x2=2 x=2 x1=1,x2=2
-x2+(-2)2=(x-2)(x+2) x2+2x-1=(x-1)2 4x2-4x+1=(2x-1)2 x2-4x=x(x+2)(x-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)