计算 -36x^ 2+12xy-y^2
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计算-36x^2+12xy-y^2计算-36x^2+12xy-y^2计算-36x^2+12xy-y^2-36x^2+12xy-y^2=-(36x^2-12xy+y^2)=-(6x-y)^2
计算 -36x^ 2+12xy-y^2
计算 -36x^ 2+12xy-y^2
计算 -36x^ 2+12xy-y^2
-36x^ 2+12xy-y^2
=-(36x^ 2-12xy+y^2)
=-(6x-y)^2