1 On the number line ,the distance between point A and point C is 5 and the distance between point Band point C is 20.Does point C lie between point A and point B?
(1) The distance between point A and point B is 25.
(2)Point A lies to the left of point B.
2. In a certain bathtub,both the cold water and the hot water fixtures leak .The cold water leak alone would fill the same buckets in C hours ,and the hot water leak alone would fill the same bucket in H hours ,where C<H.If both fixtures begain to leak at the same time into empty bucket at their respective constant rates and consequently it took T hours to fill the bucket ,which of the following must be true?
(1) 0<T<H (2)C<T<H (3)C/2<T<H/2
3.Is 2x-3y<x^2?
(1)2x-3y=-2 (2)x>2 and y>0
question1---A
question2---(1)(2)(3)since T=ch/(c+h),given c<h, u can get (3)
question3---D
| 欢迎光临 ChaseDream (https://forum.chasedream.com/) | Powered by Discuz! X3.3 |