|

【数学 刷题打卡团 -9743】

493人已做
73%正确率
The“reflection”of a positive integer is obtained by reversing its digits. For example, 321 is the reflection of 123. The difference between a five-digit integer and its reflection must be divisible by which of the following?
【数学 刷题打卡团 -9744】

189人已做
90%正确率
In an xy-coordinate system,if line k intersects the y-axis at(0,6)and has a slope of -3,then k intersects the x-axis at
【数学 刷题打卡团 -9745】

181人已做
75%正确率
When a certain coin is flipped, the probability of heads is 0.5. If the coin is flipped 6 times, what is the probability that there are exactly 3 heads?
【数学 刷题打卡团 -9746】

196人已做
81%正确率
In 1988 Mr.Smith's annual income was greater than Mrs.Smith's annual income.In 1989 Mr.Smith's annual income decreased by p percent.whereas Mrs.Smith's annual income increased by p percent.p>0
【数学 刷题打卡团 -9747】

176人已做
93%正确率
Each circle has center O. The radius of the smaller circle is 2 and the radius of the larger circle is 6. If a point is selected at random from the larger circular region, what is the probability that the point will lie in the shaded region?
【数学 刷题打卡团 -9748】

173人已做
94%正确率
A box contains 6 black balls and 4 white balls. If two balls are selected at random without replacement, what is the probability that both balls are white?
【数学 刷题打卡团 -9749】

175人已做
79%正确率
The probability that event A occurs is 0.4, and the probability that events A and B both occur is 0.25. If the probability that either event A or event B occurs is 0.6, what is the probability that event B will occur?
【数学 刷题打卡团 -9750】

194人已做
94%正确率
The two-digit integer that equals twice the sum of its digits
【数学 刷题打卡团 -9751】

175人已做
56%正确率
In how many different ways can 3 identical green shirts and 3 identical red shirts be distributed among 6 children such that each child receives a shirt?
【数学 刷题打卡团 -9752】

437人已做
62%正确率
A certain money market account that had a balance of \$48,000 during all of last month earned \$360 in interest for the month.At what simple annual interest rate did the account earn interest last month?
• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• ...
• 13

1.使用雷哥网GRE的时间？

2.通过何种渠道了解到雷哥网GRE？

3.使用雷哥GRE的用途？（可多选）

4.使用雷哥网GRE曾遇到的问题？（可多选）

5.你对雷哥网GRE的优化建议（可多选）

6.向朋友推荐雷哥网GRE的可能性？