(a+1)²+(2b+3)²+丨c-1丨=0
则可判定
a+1=0
2b+3=0
c-1=0
解得:a=-1,b=-3/2,c=1
3abc+a³-c³
=3×(-1)×(-3/2)×1+(-1)³-1³
=9/2-2
=5/2