x√y+y√x-√2003x-√2003y+√2003xy-2003
= √x(√xy-√2003) + √ y(√xy-√2003) + √2003 (√xy-√2003)
= (√x+√y+√2003) (√xy-√2003)
等式变形x√y+y√x-√2003x-√2003y+√2003xy=2003怎么变形为(√xy-√2003)(√x+√y
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