计算:(2x+y+1)(2x+y-1)
问题描述:
计算:(2x+y+1)(2x+y-1)
答
原式=(2x+y)2-12
=4x2+4xy+y2-1.
计算:(2x+y+1)(2x+y-1)
原式=(2x+y)2-12
=4x2+4xy+y2-1.