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190302
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The length, width and height of cuboids are x, y, and z, respectively. If the length, width and height of a cuboid are changed to 3x, 5y, and 4z, respectively. How many times the volume of larger cuboid as that of the original cuboid?
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190302 还原机经选题: 数论&代数
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A,B are two-digit integers. The tens of A is three. The unit digit of B is 5. A(B+1)=2016. 5A+2B=？
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190302
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The general term of {$$a_n$$} is $$a_{n+2}$$=$$a_n$$+11. Does 633 belong to the sequence {$$a_n$$}?
1：$$a_1$$=50
2：$$a_2$$=49
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190302
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A driver usually takes 4.5 hours to drive 270 km. If his speed is 10 km/h slower than usual due to rain, how long does it take to drive the same distance?
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190302
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The length of the three sides of a triangle is 6, x, 2x. What is the range of x?
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190302
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There are 13 numbers in a sequence. What is the median of this series?
1: The average of this series is 74.
2: If the largest number and the smallest number are deleted, the median of the new sequence is 72.
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190302
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A cyclist rides twice around a track whose circumference is 50 km. The average speed of the first lap was 40 km/h, and the average speed of the second lap was 20 km/h. What's the average speed of his ride?
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190302 还原机经选题: 文字题&几何
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A company produced a kind of products and sold them at a discount this quarter. The sales revenue of this quarter was 40% higher than that of last quarter. What was the percentage increase of sales volume in this quarter compared with last quarter?
1: The price of each item before the discount was $5.
2: The price of each item was reduced by 20%.
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190302
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There are only two types of employees in a company, workers and managers. The range of wages between workers is $1000 a month. The difference between the managers is $3000 a month. What's the minimum difference of the wages for all employees in this company?
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190407
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f(m,n)=$$(-1)^{m}$$$$\frac{n}{2m+n}$$,g(n)=min{f(1,n),f(2,n),f(3,n)}.当n = 1,2,3时，g(n)的最大值是多少？
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190407
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f(x)=$$x^{2}$$$$(1-x)^{2}$$. f(1-x)=?
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190407
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$$a_n$$=$$a_{n-1}$$ - $$b_{n-1}$$,$$b_n$$=$$a_{n+1}$$ + $$b_{n+1}$$ . $$a_1$$=1,$$a_2$$=2.$$a_4$$=?
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191222
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If a and b are positive integers, which are less than 10, what is the range of a/b?
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191222
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What's the value of [(3*√32 - 4*√2) /√8 ]^2？
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191222
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A car has to go from one place to another, the average speed in city road is 15 miles/hour, and the average speed in highway is 60 miles/hour. Then it goes 5 miles in city road and goes 50 miles in highway, what is the total average speed? (results are round to the nearest integer)
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191222
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As shown in the figure, what is the expression for the trapezoid area？
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191222
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Given that positive integer p is not a square number，is p prime ?
(1)Only p itself is the factor of p that is greater than $$\sqrt{p}$$
(2)Only 1 is the factor of p that is smaller than $$\sqrt{p}$$
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191222
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The height of tower A is 50 meters, of tower B is 200 meters, and the distance between these two towers is 300 meters. The government plans to build a wall between A and B , and the wall should not exceed the straight line of the tops of tower A and B. What is the greatest height of the wall if it is 100 meters away from the tower A ?
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191222
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If two dice are flipped at the same time, what is the probability that “6” shows up at least once ?
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191222
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|2-|2-x||=2，How many solutions do X have?
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