恒等式

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(X + 12)2

=X2 +( ) + ( ) 

= X2 +( ) + ()          
       
        (X + 12)2 
=          
=
(2X + 5)2

= (2X )2 +( ) + ( )

= ( ) + ( ) + ( ) 

     
   (2X + 5)2 
=          
=
(X - 10)2

= X2 - ( ) + ( ) 

= X2 - ( ) + ()
 (X - 10)2 
=          
=
(3X - 4)2

= (2X )2 +( ) + ( )

= ( ) + ( ) + ( )

(3X - 4)2
=        
=
(X - 7)(X + 7)

= ( ) - ( )

= ( ) - ( )

(X - 7)(X + 7)
=         
=

2X - 9)(2X + 9)

= ( ) - ( )

= ( ) - ( )

(2X - 9)(2X + 9)

=         
=
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