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原式=x²;-Y²;-x-5y-6 =(x²;-x+1/4)-(Y²;+5y+25/4) =(x-1/2)²;-(Y+5/2)²; =[(x-1/2)+(Y+5/2)][(x-1/2)-(Y+5/2)] =(x+Y+2)(x-Y-3)
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