问题
选择题
已知方程x2+bx-2=0的一个根是1，则另一个根是（ ）
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答案
设方程的另一根为x1，
根据题意得1•x1=-2，
所以x1=-2．
故选B．
搜题请搜索小程序“爱下问搜题”
已知方程x2+bx-2=0的一个根是1，则另一个根是（ ）
|
设方程的另一根为x1，
根据题意得1•x1=-2，
所以x1=-2．
故选B．
| 根据内容完成表格。 | ||||||||||||||||
| Lingling is a student. She is from China and she is Chinese. How old is she? She is thirteen. She is in Class Two. Tom is an eleven-year-old boy. He isn't from China. He is from England and he is English. He is in Class Two, too. Lucy is a girl from America. She is only five years old. She isn't a student. | ||||||||||||||||
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