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190207
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When a driver runs a long distance, the boss will pay her $10 / h and $0.5/mile. She received a total of $100. How many miles did she drive this time?
1: The average speed is 50mile/h
2: She ran 5/12 of the way at 58 mile/h. The average speed of the rest of the journey was 39 mile/h.
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190207
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Is the area of a circle larger than that of a square?
1: The circumference of a circle is greater than the circumference of a square.
2: The diameter of the circle is larger than the side length of the square.
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190207
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A factory works 22 days a month, 7.5 hours a day, and can produce 550 products per hour. But in the first seven days of December, due to circuit failure, no work was started. In order to catch up with the normal progress, how many more products should be produced in the following days of the month?
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190207
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|$$\frac{x^{2}}{x}$$|=? x≠ 0
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190207
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There are nine points on a circumference. How many different hexagons can be formed by selecting 6 of these 9 points?
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190603 还原机经选题: 数论&代数
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As shown in the figure, A splices squares with matches, and 3 matches will be used for each additional square, which will be marked as an S; B uses matches to splice geometric figures on the basis of trapezoids, and 2 matches will be used for each additional geometric figure, which will be marked as a T. A spliced n additional squares, b spliced m additional geometric figures. What is the value of m?
(1)n = m
(2)Two people have used the same number of matches
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190603
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A set S consists of consecutive integers. How many even numbers are included in the set S?
(1). Set S has 34 odd numbers
(2). Set S has 68 even numbers
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190603
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1/(1-√1/2)=?
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190603
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Given that ∠BAC is a right angle, AB = 15, AC = 20, AD is the height on the BC side. What is the value of AD?
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190603
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Type [1,229] on the keyboard. How many times is 9 pressed？
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190603
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In the following figure, the coordinates of the points in the rectangle are expressed as (x, y). So what is the probability that x+y is less than or equal to 4?
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190603
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As shown in the figure, ABE and CDE are isosceles triangles, BC and AD are parallel, and the sum of the perimeter of ABE and CDE is 32. What is the range of AB length?
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190603
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In the coordinate system, for a quadrilateral, the coordinates of four vertices are (1,0), (3,0), (3,1), (1,1) respectively. There is a straight line passing through the point (0,0) and divide the quadrilateral area into two equal parts. What is the slope of this straight line?
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190603
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As shown in the figure, the four sides of the rhombus are all equal to 52, the diagonal are perpendicular to each other, and the shorter one is 40 in length. What is the shadow area?
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190603
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|x|+|y|≤1，x²+y²=1，How many points satisfy these two conditions at the same time?
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190207
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What is the reminder of $$2^{2550}$$ when divided by 7?
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190207
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1+x+$$x^{2}$$+$$x^{3}$$+$$x^{4}$$ < $$\frac{1}{1-x}$$? x≠1
1：x < 1
2：x > 0
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190207
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x+y=120, x+z=100. What is the value of x ？
1：x+y+z=160
2：y+z=100
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190207
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a=x+$$\frac{1}{x}$$,b=x-$$\frac{1}{x}$$,$$\frac{(2^{a})^{2}}{(2^{b})^{2}}$$=?
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190207
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One item's listed price is 10% less than its regular price. It was sold with another 50% discount, by what percent discount of the regular price the item was sold?
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