(-1\2x-1\3y)(1\2x-1\3y)

问题描述:

(-1\2x-1\3y)(1\2x-1\3y)

=-(1/2x+1/3y)(1/2x-1/3y)
=-(1/4x²-1/9y²)
=1/9y²-1/4x²

(-1\2x-1\3y)(1\2x-1\3y)
=1/9y²-1/4x²
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