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191020
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A fair coin is tossed twice，what's the probability of getting at least one head?
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191020
|
As shown in the figure, a semicircle is spliced with a rectangle. The rectangle is x in width and y in length. If the area of semicircle is 1/3 of the area of rectangle. What is the ratio of the arc of the semicircle to x?
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191020
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Two straight lines intersect at (1, -1), and given that the product of the slopes of two lines is -1. One of the lines intersects the x axis at (3,0). What is the intercept of the other line with the Y-axis？
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191020
|
$$2^n = 2^x + 2^x + 2^x + 2^x $$, what's the value of x in terms of n?
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191020
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When m and n are divided by 7, the remainders are both 3, so what is the remainder when mn is divided by 7?
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191020
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There are three numbers. Is the smallest number less than 12000?
(1). the average of the three numbers is 18000
(2). the median is 2000 above the average
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191020
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f(x)=1-x，-f(-f(-x))=?
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191020
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Is x < y ?
(1)x/y=7/9
(2)xy>0
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191020
|
Each letter of the word “College” is written on a piece of paper (7 pieces of paper in total). Now just take one piece of papers randomly. What is the probability of getting a letter that happens to appear twice (l or e)?
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191020
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r s t are all positive integers, and r < s < t，what is the value of r?
(1)rst=6
(2)r+s+t=6
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191020
|
Cylinder A has a radius of 1 and a height of 4. The other cylinder B has a radius of 1.5. If two cylinders have the same volume, what is the height of B?
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191020
|
How much longer is route HSW than route HTW?
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191020
|
$$\frac{1}{4}$$ ·$$20^8$$=?
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191031
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A represents all multiples of 3 from 1 to 50 (inclusive), B represents all multiples of 5 from 1 to 50 (inclusive). How many numbers are there in the set of A and B?
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191031
|
Given q = (10k-n) / 7, where q is a positive integer, and k , n are positive integers less than 7, what is the maximum value of q?
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191031
|
One person is prepared to complete 4 tasks, named, A,B,C,D . How many different ways can A be completed before B?
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190215
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Event E and event F are independent events. The probability of the occurrence of event E is 0.4 and that of event F is 0.5. What is the probability that the events occur at the same time?
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190215
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Is the sum of x and y a multiple of 3? x,y,z are integers.
1: x+z is a multiple of 3.
2: x+2z is a multiple of 3.
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191031
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What is the value of remainder when 2 ^ 5550 is divided by 7?
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190215
|
Five boys and four girls are supposed to be arranged in a line. Boys and girls must be arranged alternately, that is to say, boys' left and right must be girls. How many queuing methods are there?
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