A + A + A = 9( )+( )= 18( )+ A = ( )括号中该怎么填?

问题描述:

A + A + A = 9
( )+( )= 18
( )+ A = ( )
括号中该怎么填?

A + A + A = 9
( 9 )+(9 )= 18
( 1)+ A = (4)