2大题,1,2小题,,
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/27 18:55:15
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
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