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190321
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Quadrilateral ABCD is a rectangle. AD=20, AM=DN, BP=QC. PQ=?
1：BP+QC=MN
2：AM+ND=PQ
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190415
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x,y>0,$$\sqrt{x}$$-$$\sqrt{y}$$=?
1：$$\sqrt{x}$$-$$\sqrt{y}$$=8$$\sqrt{xy}$$
2：$$x^{2}$$-$$y^{2}$$=2xy
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190321
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The ratio of the three sides of a triangle is 5:12:13. The length of longest side of the triangle is 52. What is the area of a triangle?
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190321 还原机经选题: 数论&代数
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n is a positive integer. What is the reminder of when divided by 12?
1: n is even.
2: n is a multiple of 3.
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190321
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The line $$l_1$$ is perpendicular to the line $$l_2$$, whose equation is y=3x+4. What is the slope of $$l_1$$?
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190321
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Circle O is internally tangent to a square ABCD. The radius of circle O is 2m. What is the area of the shaded part of the graph?
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190321
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The area of a square is 36. What is the perimeter of this square?
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190321
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$$2^{x+y}*2^{-(x-y)}$$ = ?
1:x=2
2:y=4
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190321
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What is the sum of the interior angles of the octagon?
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190321
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ABCD is a parallelogram. BF=2. AE=？
1：∠ABE=10°；∠CBF=30°
2：∠ABC=40°；∠BAD=140°
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190321
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X and Y are two discrete primes. X=?, Y=?
1：X-Y=5
2：X+Y=9
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190321
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Five spaces will be filled with numbers 1-5 at random and use each number only once. What's the probability that these 5 numbers are arranged in order from large to small or from small to large?
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190124
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The size of the rectangular ground is 12 feet * 9 feet. If the ground is covered with square tiles whose length is 9 inches. How many tiles are needed? (1 foot = 12 inch)
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190124 还原机经选题: 文字题&几何
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The shop sold two shirts and one belt at a discount. What's the average discount?
1: Each shirt was 20% off.
2: The belt was 10% off.
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190124
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The swimming pool will be filled with water whose rate of flow is 50 L/min. The pool is 120 $$m^{3}$$ in total. How many hours is necessary to fill 2/3 of the pool?
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190124
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The positive integer p is less than 50. When p is divided by 7, the remainder is 1. p=?
1: When p is divided by 9, the remainder is 7.
2: When p is divided by 4, the remainder is 3.
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190124
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AB=9, BC=4. A,B,C are not collinear. Which of the following may be the distance of AC?
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190124 还原机经选题: 文字题&几何
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The x-intercept and y-intercept of line l are $$x_c$$ and $$y_c$$, respectively. What is the slope of line ?
1：$$x_c$$$$y_c$$>0
2：(1,1) is in the line .
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190124
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In sector AOB, ∠O=45°. The radius of the sector is 4. BC is perpendicular to OA. What is the area of the shadow?
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190124 还原机经选题: 文字题&几何
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Two circles are drawn with the two long sides of the rectangle ABCD as the diameter. The centers of the circles are E and F. EF intersects two circles at G and H, respectively. What is the circumference of the rectangle ABCD?
1:AE=9
2:EG=GH
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