若x2+4y2=(x+2y)2+A=(x-2y)2+B,则A,B各等于( )
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若x2+4y2=(x+2y)2+A=(x-2y)2+B,则A,B各等于( )
A. 4xy,4xy
B. 4xy,-4xy
C. -4xy,4xy
D. -4xy,-4xy
A. 4xy,4xy
B. 4xy,-4xy
C. -4xy,4xy
D. -4xy,-4xy
![若x2+4y2=(x+2y)2+A=(x-2y)2+B,则A,B各等于( )](/uploads/image/z/2117259-27-9.jpg?t=%E8%8B%A5x2%2B4y2%3D%EF%BC%88x%2B2y%EF%BC%892%2BA%3D%EF%BC%88x-2y%EF%BC%892%2BB%EF%BC%8C%E5%88%99A%EF%BC%8CB%E5%90%84%E7%AD%89%E4%BA%8E%EF%BC%88%E3%80%80%E3%80%80%EF%BC%89)
∵x2+4y2=x2+4xy+4y2+A=x2-4xy+4y2+B,
∴A=-4xy,B=4xy.
故选C
∴A=-4xy,B=4xy.
故选C
若x2+4y2=(x+2y)2+A=(x-2y)2+B,则A,B各等于( )
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