已知(A+B)²+|2B-1=0,则6AB-2AB-3(AB-1)=
问题描述:
已知(A+B)²+|2B-1=0,则6AB-2AB-3(AB-1)=
答
の希の望
∵(A+B)²+|2B-1|=0
且(A+B)²≥0,|2B-1|≥0
∴A+B=0,2B-1=0
解得A=-1/2,B=1/2
∴6AB-2AB-3(AB-1)
=6AB-2AB-3AB+3
=AB+3
=-1/4+3
=11/4