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190215
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Is 4 a factor of 4?
1: x-y is even.
2: x+y is even.
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191031
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There are 5 green balls and 5 white balls in the box, numbered 1.2.3.4.5. Now a white ball and a green ball are taken away. What is the number on the green ball taken?
1: If one ball is selected from the remaining balls, the probability of selecting an even green ball is 1/8.
2: If one ball is selected from the remaining balls, and the probability of taking “4” is 1/4.
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190207
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h(x)=x-$$x^{2}$$. Is h(a) > h(b)?
1：a < b
2：$$a^{2}$$ > $$b^{2}$$
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190207
|
$$\frac{\sqrt{3}+\sqrt{2}}{\sqrt{3}-\sqrt{2}}$$=?
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190207
|
It took 8 hours for a machine to finish 4/11 of the work. How many more 8 hours will it take to finish the rest of the work?
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190207
|
Machine A takes 24 hours to empty one cylinder of water. Machine A drains the water for 8 hours and then change to machine B. B's speed is 2 / 3 of that of A's. How long does it take B to drain the remaining water?
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190207
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The line $$l_1$$ goes through (3,-2). The line $$l_2$$ goes through (0,3) and (3,5). $$l_1$$ is perpendicular to $$l_2$$. What is the algebraic expression of the line $$l_1$$?
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190207
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A cuboid container is made of plastic. The length, width and height of the cuboid cavity inside are x, y and z respectively. The thickness of the six sides is 1. What's the volume of the plastic used to make this container?
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190207
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There are three colors of candy in an opaque bag, including two white candy, three red candy and one blue candy. Two candies will be taken out randomly from this bag. What's the probability of taking at least one white candy?
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190215
|
n small balls with radius r were put into a cylinder filled with water, and the small balls were completely submerged in the water. The radius of the bottom circle of the cylinder is 4r, and the height of water before and after putting the balls is $$h_1$$ and $$h_2$$. How to express the difference of $$h_2$$ and $$h_1$$ with n and r?
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190207
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Is x < y ?
1：x > 0
2：$$x^{2}$$ < xy
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190215
|
The formula of a straight line in the plane rectangular coordinate system is y = 2x-2. The center of circle O is on this line. The circle and line intersect at P and Q. What is the area of the circle?
1: Center coordinates (5, 8)
2: The difference between the abscissa of P and Q is 2
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191020
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There is a triangle where the ratio of three internal angles is 5:15:16. What is the degree of the smallest angle?
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191020
|
Taking three numbers out of twenty consecutive integers, then how many cases where the three numbers are not consecutive?
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191020
|
What is the value of the difference between the mean of the smallest thirty positive integers and that of the smallest thirty non-negative integers？
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191020
|
Is x-y>0 ？
1：y<0
2：2x-y>0
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191020
|
If 4^4^4=2^2^x, what is the value of x ？
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191020
|
After Tom walked from A to B, he decided to start going back. When he reached 10% of the whole journey,what fraction of the total round trip is the trip he has traveled?
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191020
|
It is given that:√x and √y are integers, which of the following must be an integer?
I. √x√y
II. √（x+y）
III. √x/√y
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191020
|
If x is a prime number, what is the remainder when x is divided by 8?
(1)The remainder is 1 when x is divided by 2
(2)The remainder is 2 when x is divided by 3
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