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丶耶路撒冷丬°,你好:
x(x-5)=2005
解:x²-5x-2005=0
x²-5x+25-2030=0
(x-5)²-2030=0
(x-5+√2030)(x-5-√2030)=0
x1=5-√2030,x2=5+√2030
x(x-5)=2005
解:x²-5x-2005=0
x²-5x+25-2030=0
(x-5)²-2030=0
(x-5+√2030)(x-5-√2030)=0
x1=5-√2030,x2=5+√2030
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