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190302
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Someone rode 30 km. What's his average speed?
1: The average speed of his first 20 km was 20 km/h.
2: The average speed of his last 20 km was 10 km/h.
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190302
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Is x < 0？
1：$$x^{3}$$ < $$x^{4}$$
2：$$x^{3}$$ < $$x^{2}$$
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191031 还原机经选题: 数论&代数
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A straight line y=mx+b, a parabola$$ y=x^2+c$$. are the number of intersections of these two images no less than 1?
(1)b≥c
(2)m^2≥4(c-b)
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191031
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There are two cars, one is fast and the other is slow. They have been driving for 5 hours. What is the distance of the slow car?
(1)the average speed of fast car is 4mile/h faster than that of the slow car
(2)the distance traveled by the fast car is 170miles
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191222
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Given x + y is an integer, is y an integer?
(1)x-y is an integer
(2)x + 2y is an integer
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191222 还原机经选题: 数论&代数
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p q r are positive integers, p+q+r=5, how many factors does $$2^p3^q5^r$$ have?
(1)p+q=3
(2)q+r=3
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191222
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Given that the line AB is tangent with cicle ⊙O at point B, the radius r of ⊙O is 2. What is the area of the shaded area ?
1：OB=AC
2：BC=OB
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191222
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Is abx greater than 0？
1：ax>0
2：bx>0
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191222
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If x and y are positive numbers, is $$x^5 < y^3$$?
(1)$$x^4 < y^3$$
(2)$$x^5 < y^4$$
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191222 730高分节-数学测试
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Given that k=0.xyzxyzxyzxyz…, what is the value of z ?
(1)1000k-k is divisible by 5
(2)1000k-k is an even integer
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191222
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Is quadrilateral ABCD a rectangle?
(1) two adjacent angles are right angles
(2)two diagonals are equal
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191222
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Is the average score of 21 students greater than 80?
(1)The median is 91
(2)The least score is 70
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200301
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x and y are both greater than 0，what is the value of √x-√y？
(1). √x-√y=2*4√xy
(2). x^2-y^2=2xy
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200301
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s, r, t are integers，is t/(s^2) an integer?
(1). t/sr is an integer
(2). r/s is an integer
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200301
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Insert two symbols “+” in 1,2,3,4,5 to form the number X, and the two symbols must be separated by at least one number, for example: insert a symbol between 2 and 3, and a symbol between 4 and 5, X=12+34+5=51, is X even?
(1). X is a three-digit number
(2). there is a symbol between 1 and 2
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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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x+y=z. Is y > 0？
1：y=x+z
2：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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