Question

若丨2a+b+1丨+(a-1)²=0,则b-a=___

Answer 1

丨2a+b+1丨+(a-1)²=0

因为|2a+b+1|>=0 (a-1)^2>=0

所以|2a+b+1|=(a-1)^2=0

2a+b+1=a-1=0

b=-2a-1 a=1

b=-2*1-1=-3

b-a=-3-1=-4