已知|a+12 |+b2-6b+9=0.
|a+12 |+（b-3)2=0
|a+12 |=0 a=-12
(b-3)2=0 b=3
【（2a+b）2+(2a+b)(b-2a)-6ab】÷2b
=【（2a+b）(2a+b+b-2a)-6ab】÷2b
=【2b（2a+b）-6ab】÷2b
=2a+b-3a
=b-a
=3-(-12)
=15|a+12|这的12是2分之1，sorry不对，是a+12的绝对值是a+2分之1的绝对值,打错了已知|a+1/2 |+b2-6b+9=0.|a+1/2 |+（b-3)2=0 |a+1/2 |=0 a=-1/2 (b-3)2=0b=3【（2a+b）2+(2a+b)(b-2a)-6ab】÷2b=【（2a+b）(2a+b+b-2a)-6ab】÷2b=【2b（2a+b）-6ab】÷2b=2a+b-3a=b-a=3-(-1/2)=3.5