Sorry bạn
đề đúng là đây x−1x−2" role="presentation" style="display: inline-table; line-height: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">x√−1x√−2x−1x−2