(1)a(b-3)²-4(b-3)²
=a(b²-6b+9)-4(b²-6b+9)
=((b²-6b+9)(a-4)
=(7²-6*7+9)(5-4)
=(49-42+9)*1
=16
(2)4x(m-2)-5(m-2)
=(m-2)(4x-5)
=(2008-2)(4*1.5-5)
=2006
(1)a(b-3)²-4(b-3)²
=a(b²-6b+9)-4(b²-6b+9)
=((b²-6b+9)(a-4)
=(7²-6*7+9)(5-4)
=(49-42+9)*1
=16
(2)4x(m-2)-5(m-2)
=(m-2)(4x-5)
=(2008-2)(4*1.5-5)
=2006