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已知(a²+b²)²-2(a²+b²)=8，求a²+b²的值？解一元二次方程
初中数学：(a²+b²)²-2(a²+b²)=8，求a²+b²的值？解一元二次方程
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139/168
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