解方程x2+x+1=2x2+x时，如果设y=x2+x，那么原方程可化为（）A．y2+y-2=0B．y2-y+2=0C．y2+y+2=0D．y2-y-2=0-数学

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• 短文改错。 假定英语课上老师要求同桌之间交换修改作文，请你修改你同桌写的以下作文。文中共有10 处语言错误，每句中最多有两处。错误涉及一个单词的增加、删除或修改。增加-高三英语
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• 解方程：。-九年级数学
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• 解方程-八年级数学
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