【简介】感谢网友“雕龙文库”参与投稿，这里小编给大家分享一些，方便大家学习。
11、S=，T=。One number is selected from S, and the other number is selected from T. What is the probability that the product of the two numbers is negative?
【答案】1/2
【思路】C5 1C3 1 / C5 1C6 1=1/2
12、
What is the function of the curve above?
y = x^3 - x^2
y = - x^3 + x^2
y = - x^3 +x
y = x^3 - x
y = x^3 + x
【答案】
【思路】根据图形可以知道应该找与X轴有三个交点，也就是y等于0时可以解出三个实根的方程。排除、、，因为只有两个实根，也是有两个实根，只有一个实根，只有是对的。又可以通过增减函数来排除，图形告诉我们X向正无穷方向增加，Y的值也随之增加，从某点开始为增函数，再看方程明显从某点开始后为减函数，因此是对的。
分页标题#e#
13、0-50中，被3整除余1的数有多少个?
【答案】有17个
【思路】0=3x+1=50 x=0.16
14、N is the sum of the first K consecutive positive integers, where 101=150. What is the sum of 1/N?
【答案】2
【思路】把first consecutive 理解为是从1开始到k 的数列。
N=K/2
1/N=2/K=2 1/K
因为1/K=1/K 1/
所以 2/K=2 =2
15. There are six cards each with a number from 1 to 6. Draw one card randomly and then put it back into a bowl. If one card is to be drawn randomly, and the sum of two cards is 8, whats the probability that the card is 5?
【答案】2/5
【思路】因放回，两张cards之和=8有5种可能，2 6，6 2，3 5，5 3，4 4，其中出现5的可能有2种。
11、S=，T=。One number is selected from S, and the other number is selected from T. What is the probability that the product of the two numbers is negative?
【答案】1/2
【思路】C5 1C3 1 / C5 1C6 1=1/2
12、
What is the function of the curve above?
y = x^3 - x^2
y = - x^3 + x^2
y = - x^3 +x
y = x^3 - x
y = x^3 + x
【答案】
【思路】根据图形可以知道应该找与X轴有三个交点，也就是y等于0时可以解出三个实根的方程。排除、、，因为只有两个实根，也是有两个实根，只有一个实根，只有是对的。又可以通过增减函数来排除，图形告诉我们X向正无穷方向增加，Y的值也随之增加，从某点开始为增函数，再看方程明显从某点开始后为减函数，因此是对的。
分页标题#e#
13、0-50中，被3整除余1的数有多少个?
【答案】有17个
【思路】0=3x+1=50 x=0.16
14、N is the sum of the first K consecutive positive integers, where 101=150. What is the sum of 1/N?
【答案】2
【思路】把first consecutive 理解为是从1开始到k 的数列。
N=K/2
1/N=2/K=2 1/K
因为1/K=1/K 1/
所以 2/K=2 =2
15. There are six cards each with a number from 1 to 6. Draw one card randomly and then put it back into a bowl. If one card is to be drawn randomly, and the sum of two cards is 8, whats the probability that the card is 5?
【答案】2/5
【思路】因放回，两张cards之和=8有5种可能，2 6，6 2，3 5，5 3，4 4，其中出现5的可能有2种。
