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190124
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N is an integer. Is $$\frac{N}{225}$$ a terminating decimal?
1: N can be divided by 3.
2: N can be divided by 5.
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190124
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Is $$\frac{5m}{3n}$$ an integer? m,n are integers.
1: m is a multiple of 3.
2: n is a multiple of 5.
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190321
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Can 3n(n-1) be divided by 6?
1: n is even.
2: n-2 is even.
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190124 还原机经选题: 文字题&几何
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In the xy coordinate system, two lines,$$l_1$$ and $$l_2$$, are neither parallel to the x-axis nor to the y-axis. Do $$l_1$$ and $$l_2$$ intersect?
1: The slope of one line is twice that of the other
2: One line passes through (0,0) and the other passes through (2,0).
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190124
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$$\frac{1}{(2n-1)!}$$ - $$\frac{1}{(2n+1)!}$$=$$\frac{an^{2}+bn+c}{(2n+1)!}$$,a+b+c=?
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190124
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x=3 - $$\sqrt{2}$$ is the solution of which of the following equations?
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190124
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Which of the following functions has no intersection with the x axis?
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190124 还原机经选题: 文字题&几何
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The equation of line l isy=ax+b . Does l go through the fourth quadrant?
1：a > 0
2：b < 0
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190321
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One snowball on the ice lost two-thirds of its volume in one hour and two-thirds of its remaining volume in the next hour. At this point, the volume of the snowball is $$\frac{1}{5} m^3$$. What was the volume of the snowball at first?
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190321
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In a rectangular plane coordinate system, the equation of circle O is $$x^2+y^2=10$$. How many points are there on circle O whose abscissa and ordinate are integers?
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190321 还原机经选题: 文字题&几何
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Someone ran 6 miles/h for a while, then she rode at the speed of 15 miles/h. Her cycling time was 16 min longer than her running time. The distance of cycling was 10 miles longer than the distance of running. How long did she run?
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190415
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There are eight points on the plane. Every three points are not on the same line. How many different triangles can be created if 3 of these points are chosen?
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190321
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m and v are integers. m+v=?
1：mv=6
2：$$(m+v)^2=25$$
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190321
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In a Cartesian coordinate system, a straight line goes through the point (1,p). Is the slope of this line greater than 0?
1: This line goes through the point (p,13).
2: The line goes through the point (0,1).
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190415 还原机经选题: 数论&代数
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ababa is a five-digit integer. Can ababa be divided by 3?
1: a can be divided by 3.
2: b can be divided by 3.
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190415
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What's the largest prime factor of $$2^{32}$$+$$4^{16}$$+$$8^{8}$$?
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190415
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190321
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In the rectangle ABCD, E,F,G and H are the midpoints of each side, BC=x, CD=y. How to express the shaded area with x and y?
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190310
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A, B is independent of each other. The probability of occurrence of event A is 1/3, and that of event B is 1/2. What is the probability that only A or B will happen?
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190310
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There are 21 students in a class. Does the average score of the class exceed 80?
1: The median score of the students in the class is 91.
2: The lowest score of the students in the class is 78.
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