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初中数学：方程2x²-5x-1=0的两实数根，怎么求2a²+3ab+5b的值？
初中数学：方程2x²-5x-1=0的两实数根，怎么求2a²+3ab+5b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48/168
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