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数学9年级：已知xy+x+y=23，x²y+xy²=120，如何求x²+y²的值？
数学9上：已知xy+x+y=23，x²y+xy²=120，如何求x²+y²的值？
初中数学，解一元二次方程，根的判别式，韦达定理，中考培优真题72/168
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