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初中数学：已知(x²+y²-1)(x²+y²-2)=0，怎么求x²+y²的值？
初中数学：已知(x²+y²-1)(x²+y²-2)=0，怎么求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91/168
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