若x²+4y²=(x+2y)²+A=(x-2y)²+B.则A,B等于
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若x²+4y²=(x+2y)²+A=(x-2y)²+B.则A,B等于
若x²+4y²=(x+2y)²+A=(x-2y)²+B.则A,B等于
若x²+4y²=(x+2y)²+A=(x-2y)²+B.则A,B等于
A=x²+4y²-(x+2y)²
=x²+4y²-x²-4xy-4y²
=-4xy
B=x²+4y²-(x-2y)²
=x²+4y²-x²+4xy-4y²
=4xy