下列因式分解正确的是( )A.x2+y2=(x+y)(x+y)B.x2-y2=(x+y)(x-y)C.-x2+y2=(-x+y)(-x-y
下列因式分解正确的是()A.x2+y2=(x+y)(x+y)B.x2-y2=(x+y)(x-y)C.-x2+y2=(-x+y)(-x-y)D.-x2-y2=-(x+y)(...
下列因式分解正确的是( )A.x2+y2=(x+y)(x+y)B.x2-y2=(x+y)(x-y)C.-x2+y2=(-x+y)(-x-y)D.-x2-y2=-(x+y)(x-y)
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