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

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

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

A + A + A = 9( )+( )= 18( )+ A = ( )括号中该怎么填?
A + A + A = 9
( 9 )+(9 )= 18
( 1)+ A = (4)