a的绝对值=2又5分之1=11/5,
b的绝对值=1.8=9/5.
a1=11/5,a2=-11/5,
b1=9/5,b2=-9/5.
1)当a1=11/5,b1=9/5时,
|a+b|=4,
2)当a1=11/5,b2=-9/5,
|a+b|=2/5.
3)当a2=-11/5,b1=9/5,
|a+b|=2/5.
4)当a2=-11/5,b2=-9/5,
|a+b|=4.
a+b的绝对值的值为:4和2/5.
a的绝对值=2又5分之1=11/5,
b的绝对值=1.8=9/5.
a1=11/5,a2=-11/5,
b1=9/5,b2=-9/5.
1)当a1=11/5,b1=9/5时,
|a+b|=4,
2)当a1=11/5,b2=-9/5,
|a+b|=2/5.
3)当a2=-11/5,b1=9/5,
|a+b|=2/5.
4)当a2=-11/5,b2=-9/5,
|a+b|=4.
a+b的绝对值的值为:4和2/5.