4x（x-y）²-12（y-x）³

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4x（x-y）²-12（y-x）³4x（x-y）²-12（y-x）³4x（x-y）²-12（y-x）³4x（x-y）²-12（y-

4x（x-y）²-12（y-x）³
4x（x-y）²-12（y-x）³

4x（x-y）²-12（y-x）³
4x（x-y）²-12（y-x）³
=4x（x-y）²+12（x-y）³
=(x-y)²（4x+12x-12y)
=(x-y)²(16x-12y)
=4(x-y)²(4x-3y)

4x（x-y）²-12（y-x）³
=4x（x-y）²+12（x-y）³
=4(x-y)²【x+3(x-y)]
=4(x-y)²(4X-3Y)

4x（x-y）²-12（y-x）³
=4x(x-y)²+12(x-y)³
=4(x-y)²[x+3(x-y)]
=4(x-y)²(4x-3y)

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