若|3b－2|＋﹙2a－b－3﹚²＝0,
3b-2=0
b=2/3
2a-b-3=0
2a=11/3
a=11/6
5﹙2a－b﹚－2﹙6a－2b＋2﹚＋﹙4a－3b－1∕2﹚
=15-18+(22/3-2-1/2)
=-3+29/6
=11/6