2大题,1,2小题,,

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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,,
 

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