~~~~~~~写出(2X+Y+1)(2X+Y-1) 计算过程~~~~~~~~~

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~~~~~~~写出(2X+Y+1)(2X+Y-1) 计算过程~~~~~~~~~

~~~~~~~写出(2X+Y+1)(2X+Y-1) 计算过程~~~~~~~~~
~~~~~~~写出(2X+Y+1)(2X+Y-1) 计算过程~~~~~~~~~

~~~~~~~写出(2X+Y+1)(2X+Y-1) 计算过程~~~~~~~~~
(2X+Y+1)(2X+Y-1)
=((2X+Y)+1)((2X+Y)-1)
=(2X+Y)2-1
=4x2+4xy+y2-1

(2x+y)^2-1
=(2X+Y+1)(2X+Y-1)