解(4x-1)(1/2x-3)=2x²-12x-1/2x+3=2x²-25/2x+3
还是
(4x-1)×[(x-3)/2]
=1/2(4x-1)(x-3)
=1/2(4x²-12x-x+3)
=2x²-13/2x+3/2