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200301
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If $$a_1$$,$$a_2$$ ,$$a_3$$ …$$a_n$$ is the sequence such that $$a_1=4$$ and $$a_n = a_{n-1}$$ for all positive integer n, what is the value of $$a_t$$ in terms of t ?
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200301
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Tom bought two computers-A and B. One was sold at 25% less than the purchase price, and the other was sold at 25% higher than the purchase price. The final price of the two computers was 2,000. After the two computers were sold, what was the Tom's profit or loss on these two computers?
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200301
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Tower X is 50 meters high and Tower Y is 200 meters high. Tower Y is 300 meters to the right of tower X and a building is to be located 100 meters from the right of X. What is the greatest possible height of the building, if the building cannot obstruct the sunlight?
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200301
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Seven different points on a circle can be connected to form different polygons. What is the ratio of the number of formed triangles to the number of formed quadrilaterals?
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200301
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As shown in the figure, the four circles are tangent to each other, and the radius is r, so what is the area of the shaded part?
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200301
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If 457*12=N, then 1 is added to which of the five numbers--4,5,7,1,2 such that difference between the new result and N is more than 2000?
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190215
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The equilateral triangle ABC is inscribed on the circle O. What is the ratio of the circumference of circle O to the circumference of triangle?
1: The area of a circle is s $$cm^{2}$$, and the circumference of a triangle is s cm.
2: The radius of the circle is r cm.
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190215
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D is the center of the circle. There are three points A, B and C on the circle. ∠ABC=？
1：∠CAD=70°
2：∠DAC=55°
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190302
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EF is tangent to a circle. ∠EBA=？
1：AC goes through the center of the circle.
2：∠BAC=55°
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190302
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($$\frac{1}{3^{2}-$$\frac{1}{3}$$*$$\frac{1}{4}}$$($$\frac{1}{3^{2} }$$+$$\frac{1}{3}$$*$$\frac{1}{4}$$}$$=
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190302
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$$t^{3}$$=3. $$t^{2}$$=?
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190302
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x+y=z. Is y > 0？
1：y=x+z
2：x=y+z
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190302
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-x+y+z = -10, -x-y+z = -10, -x+y-z = -10. x+y+z =？
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190302
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What is the range of {3,7,8,x,12,y}?
1: The average of {3,7,8,x,12,y} is 7.5.
2: 3
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190302
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x,y,z are positive integers. x+y+z=?
1：xyz=251
2：x-y-z=0
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191031
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Tom converts x euros to some dollars. The bank converts his euros to dollars firstly, and then charge 4% commissions. If Tom gets 1830 dollars finally, what is the value of x？
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191031
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In the figure, a square is inscribed with a regular octagon. The length of the side of this regular octagon is 2. How much larger is the area of this square than that of this regular octagon?
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191031
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A wall is painted with at least one of six different colors-red, yellow, blue, green, pink, and white. How many ways can white be used?
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191031
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According to the table, what is the median?
(1)4≤y≤7
(2)1≤y≤4
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191031
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There are n different books in a shelf. What is the value of n?
(1)There are only two books of mathematics, and if these two different mathematics books are adjacent, the arrangements of these n books are 240.
(2)If two books are selected randomly from the shelf, there are 15 different combinations.
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