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190215
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The weight W of the object on the earth and the distance r between the object and the center of the earth satisfy the equation W=K/r^2. When r = 4000, w = 200. When r = 5000, what is w equal to?
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190215
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At 9:10, the cinema started to show movie A with a duration of 92min. Movie B with a duration of 87min started to show at 9:35, and movie C with a duration of 117min started to show at 9:52. If two films were shown at the same time, staff were required to sell popcorn. What is the proportion of time between 9:00-11:00 when the staff need to sell popcorn?
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190215
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$$a^{2}$$ - $$b^{2}$$=21.$$a^{4}$$ - $$b^{4}$$=?
1：a+b=-3
2：a-b=7
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190215
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what is the maximum factor of $$24^{27}$$ in the following options?
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190215
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The length of three sides of an obtuse triangle is 9,40, x. What is the possible value of x?
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190215
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What is the reminder when n is divided by 8?
1: The reminder is 1 when n is divided by 2.
2: The reminder is 2 when n is divided by 3.
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190215
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G(n)=G(n-1)+n,G(1)=1,G(20)=?
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190215
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A shop only sells fish and shrimp. The businessmen sold 80kg in total yesterday. The weight of the sold fish was three times that of the shrimp. What was the total sales of the sold fish yesterday?
1: The price of fish is $8.25/kg.
2: The price of shrimp is $10/kg.
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190215
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A company has 5500 employees. These employees hold 10% of the shares. The total number of shares is $32.5 million. How much does each employee have in average because of the shares?
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190215
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An athlete's average running speed on Monday was 6 miles / h. Her average running speed on Thursday was 15 miles / h. She run 10 miles more on Thursday than on Monday. The time she spent on running was 16 min longer on Thursday than that on Monday. How much time did she spend running on Monday?
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190215
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What is the value of |x| - $$\frac{1}{|x-1|}$$=
1：x < 0
2：|x| = -x
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190215
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xy is the square of an integer. Is x the square of an integer?
1: $$y^{\frac{1}{4}}$$ is an integer.
2: $$(xy)^{\frac{1}{4}}$$ is an integer.
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190215 还原机经选题: 数论&代数
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It is given that a,b,c are prime numbers larger than 1，and abc=60. What is the value of a+b+c
1：a+b=8
2：a,b are odd.
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190215
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Beef, chicken and bacon can be added between the two hamburgers. If the order of different kinds of meat is ignored, how many different hamburgers can be made?
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190215
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Machine A is three times more efficient than machine B. How long does it take A and B to work together at the same time for 3000 pieces of work?
1: Machine B can produce 1000 goods per hour.
2: Machine a produces 2000 more pieces per hour than machine B.
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190215
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What is the reminder of x when divided by 2?
1: The reminder of (x+1) is odd when divided by 2.
2: 4 is a factor of $$x^{4}$$.
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190215
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x+2y=3t,xy=-5$$t^{2}$$,$$\frac{x^{2}+4y^{2}}{t^{2}}$$=?
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190215
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There is a cube with six faces labeled. Someone is going to paint this cube with three colors, one for each side. The colors of adjacent faces are different. How many coating methods are there?
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190215
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There are 5 numbers in a sequence. 1 is the mode and the only one. The average of the five numbers is 2.4. What is the maximum value in the sequence?
1: 2 is the median.
2: There are four different numbers in the sequence.
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191020
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As shown in the figure, what's the area of △DBC?
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