2a²-8
=2(a²-4)
=2(a+2)(a-2)
a³b-ab³
=ab(a²-b²)
=ab(a+b)(a-b)
(1/4)x²-x+1=(0.5x-1)²
-3a²+6a
=3a(-a+2)
=3a(2-a)
8x²y²-12xy²z=4xy²(2x-3z)
2003²-2002×2003
=2003×(2003-2002)
=2003×1
=2003
2a²-8
=2(a²-4)
=2(a+2)(a-2)
a³b-ab³
=ab(a²-b²)
=ab(a+b)(a-b)
(1/4)x²-x+1=(0.5x-1)²
-3a²+6a
=3a(-a+2)
=3a(2-a)
8x²y²-12xy²z=4xy²(2x-3z)
2003²-2002×2003
=2003×(2003-2002)
=2003×1
=2003