Square of 202-Square of 54 +256 * 352

=(202+54)*(202-54)+256*352 (square difference formula)

=256* 148+256*352

=256*( 148+352) (multiplication distribution rate)

=256*500

=256* 1000/2

= 128000

I think the second question should be in the following form:

(the square of 20 12-2011* 2013) 2012.

= (the square of 2012-(2012-1) (2012+1)) 2012.

= (square of 20 12-(square of 2012-1)) 2012 (square difference formula)

= (square of 2065438+02-square of 2065438 +02+1) 20 12.

= 1: 20 12

=20 12