(a-b+1)的绝对值与根号下a+2a+4互为相反数|a-b+1|+√(a+2b+4)=0 将2a换成了ba-b+1=0a+2b+4=0∴a=-5/3b=-2/3(a+b)²=(-5/3-2/3)²=49/9
(a-b+1)的绝对值=0,根号下a+2a+4=0
