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(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
2(x2-9) 2(x-3)2 2(x+3)(x-3) 2(x+9)(x-9)
x2-9+8x=(x+3)(x-3)+8x (x+3)(x-3)+8x=x2-9+8x (a+b)(a-b)=a2-b2 a2-2a(b-c)-3(b-c)2=(a-3b+3c)(a+b-c)
2(x-3)<(x-3) 2x-3<2(x-3) 2(x-3)<2x-3 2x-3<1/2(x-3)
a=-2,b=-3; a=2,b=3; a=-2,b=3; a=2,b=-3;
x2-5x+6=x(x-5)+6 x2-5x+6=(x-2)(x-3) (x-2)(x-3)=x2-5x+6 x2-5x+6=(x+2)(x+3)
-4(x-3)2+(x-3) 4(x-3)2-x (x-3) 4(x-3)2-(x-3) -4(x-3)2-(x-3)
2a-2b=2(a-b) x2-9=(x+3)(x-3) a2+4a-4=(a+2)2 -x2-x+2=-(x-1)(x+2)
(x-2)(x-3) (x-2)(x+3) (x+2)(x-3) (x+2)(x+3)
-4(x-3)2-(x-3) 4(x-3)2+x(x-3) 4(x-3)2-(x-3) -4(x-3)2+(x-3)
x2-6x+9=(x-3)2 (x+3)(x-1)=x2+2x-3 x2-9+6x=(x+3)(x-3)+6x 6ab=2a·3b