问题
选择题
方程（2x+1）（9x+8）=1的根的情况是（ ）
A．有两个不相等的实数根
B．有两个相等的实数根
C．无实数根
D．不能确定
答案
方程化为一般形式为：18x2+25x+7=0，
∵a=18，b=25，c=7，
∴△=b2-4ac=252-4×18×7=625-504＞0，
所以方程有两个不相等的实数根．
故选A．
搜题请搜索小程序“爱下问搜题”
方程（2x+1）（9x+8）=1的根的情况是（ ）
A．有两个不相等的实数根
B．有两个相等的实数根
C．无实数根
D．不能确定
方程化为一般形式为：18x2+25x+7=0，
∵a=18，b=25，c=7，
∴△=b2-4ac=252-4×18×7=625-504＞0，
所以方程有两个不相等的实数根．
故选A．
Passage Three
Which of the following statements is NOT true according to the passage
A．Over 30 oil workers have been kidnapped this year in the Niger Delta region.
B．A group calling itself the Movement for the Niger Delta People has claimed responsibility for the current reported kidnapping.
C．The last kidnapping occurred last week when a German oil worker was taken away.
D．Nigeria produces the most crude oil in Africa.