x²-4x-1=0,求(2x-3)²-(x+y)(x-y)-y²
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x²-4x-1=0,求(2x-3)²-(x+y)(x-y)-y²x²-4x-1=0,求(2x-3)²-(x+y)(x-y)-y²x²
x²-4x-1=0,求(2x-3)²-(x+y)(x-y)-y²
x²-4x-1=0,求(2x-3)²-(x+y)(x-y)-y²
x²-4x-1=0,求(2x-3)²-(x+y)(x-y)-y²
等下~马上发图