4(x-y)²-9(x-y)²+5(y-x)²-4(x-y)²
=4(x-y)²-9(x-y)²+5(x-y)²-4(x-y)²
=(4-9+5-4)(x-y)²
=-4(x-y)²
将4(x-y)²-9(x-y)²+5(y-x)²-4(x-y)²按(x-y)
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