解:
(1/4x-y)(-y-1/4x)
=-(1/4x-y)(1/4x+y)
=-[(1/4x)^2-y^2]
=-(1/16x^2-y^2)
=-1/16x^2+y^2
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解:
(1/4x-y)(-y-1/4x)
=-(1/4x-y)(1/4x+y)
=-[(1/4x)^2-y^2]
=-(1/16x^2-y^2)
=-1/16x^2+y^2