一元二次方程2x2-5x+1=0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:没有实数根
D:无法确定
We have made a survey among 1,000 students from a middle school about their favorite food. students like fruits according to the form.
Kind of food
Chocolate
Banana
Cookie
Apple
Percentage(百分比)
Of the students
20%
30%
15%
?
已知Rt△ABC中,∠C=90°,若a+b=14cm,c=10cm,则Rt△ABC的面积是( )
东欧剧变的最主要教训是( )