aa vs aaa

0A*A.

AAAaaa141121 AaAaAAaa

AAaa AA,Aa,aa? AA,Aa 4

() AAAAA1.0V~ .

AA AAAA .

AA .

AAAAAlgebraic Average.

AA AA 450225++++.

AA 3AA 4AA.

AA5 5AAR614mm50mm 5 5.