作业帮2大题,1,2小题,,
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/15 16:46:45
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2大题,1,2小题,,
2大题,1,2小题,,
2大题,1,2小题,,
① x²+2xy＋y² x²-2xy＋y²
=4+12+9 =4-12+9
=25 =1
② x²+2xy＋y² x²-2xy＋y²
=(x+y)² =(x-y)²
=（-6）² =（2）²
=36 =4