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初中数学：若a²+2b²-2ab+4b+4=0，求ab的值？配方法经典考题
初中数学：若a²+2b²-2ab+4b+4=0，求ab的值？配方法经典考题
初中数学，什么是配方法？怎么配方？基础训练，培优专题54/60
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初中数学：若a²+2b²-2ab+4b+4=0，求ab的值？配方法经典考题
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