原式=(x²-b²+y²-a²+2ab-2xy)(x²-b²+y²-a²-2ab+2xy)
=[(x-y)²-(a-b)²][(x+y)²-(a+b)²]
=(x-y+a-b)(x-y-a+b)(x+y+a+b)(x+y-a-b)
( x^2-b^2+y^2-a^2)^2-4(ab-xy)^2
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