（x^2y/4a)^2 / (-y/2ax)^2 * (-2x/ay)^4
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（x^2y/4a)^2/(-y/2ax)^2*(-2x/ay)^4（x^2y/4a)^2/(-y/2ax)^2*(-2x/ay)^4（x^2y/4a)^2/(-y/2ax)^2*(-2x/ay)^4（
（x^2y/4a)^2 / (-y/2ax)^2 * (-2x/ay)^4
（x^2y/4a)^2 / (-y/2ax)^2 * (-2x/ay)^4
（x^2y/4a)^2 / (-y/2ax)^2 * (-2x/ay)^4
（x^2y/4a)^2 / (-y/2ax)^2 * (-2x/ay)^4
= x^4y^2/16a^2*4a^2x^2/y^2*a^4y^4/16x^4
=a^4x^2y^4/64
（x^2y/4a)^2 / (-y/2ax)^2 * (-2x/ay)^4
= x^4y^2/16a^2*4a^2x^2/y^2*a^4y^4/16x^4
=a^4x^2y^4/64
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