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【数学 刷题打卡团 -9743】
难度系数:1
232人已做
74%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】
难度系数:1
106人已做
92%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】
难度系数:1
102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】
难度系数:1
112人已做
83%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】
难度系数:1
98人已做
92%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】
难度系数:1
96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】
难度系数:1
96人已做
78%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】
难度系数:1
109人已做
93%正确率
The two-digit integer that equals twice the sum of its digits
【数学 刷题打卡团 -9751】
难度系数:1
96人已做
57%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】
难度系数:1
200人已做
65%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?
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