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