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广东中考数学：已知a(a+1)=1，怎么求a的值？越简单易错，越重要
广东中考数学：已知a(a+1)=1，怎么求a的值？越简单易错，越重要
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56/168
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