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第一期
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x and y are positive integers and $$x·y^{3}$$ is an even number. Which of the following must be even?
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第一期
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If r and s are non-zero integers. Is r/s a terminating decimal?
(1)1/r is a terminating decimal.
(2)1/s is a terminating decimal.
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第一期
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The standard deviation of 33,34,35,36 is y. What is the standard deviation of 433,434,435,436?
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第一期
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If n is a positive integer, what is the remainder when $$3^{8n+3}+2$$ is divided by 5？
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第一期
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The revenue of a company in the year 2002 is 20% higher than the year 2001, and the revenue in the year 2003 is 25% lower than in the year 2002. The cost in the year 2002 is 10% lower than in the year 2001, and the cost in the year 2003 is 15% higher than in the year 2002. What is order of the total profits x, y, z of the three years 2001, 2002, 2003 from smallest to the greatest?
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第一期
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The straight-line M passes through two points A (3,0) and B (0,4). The straight-line N passes through the point A and it is perpendicular to the straight-line M. The distance between point C which is on the straight-line N and the point B is 13. What is the distance between C and A?
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第一期
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ABCDEF is a regular hexagon. ∠AOG = ？
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第一期
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Oil were equally poured into 96 cups. There were 8 ounces in each cup. How many cups are need in total to contain the oil, if the amount of oil in each cup is reduced by 1/3 of 8 ounces?
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第一期
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If $$\frac{-(3+x^2)}{9x-5}>0$$, which of the following is true?
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模考带练机经题
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X works alone for 2 hours to produce 6 machines, and Y works alone for 2 hours to produce 8 machines. In a task, at least one person is working, 44 machines are produced in 7 hours (that is, two people work together for a period of time, one person works alone for a period of time). If x and y cooperate to produce 44 machines with the shortest working time, how many hours do they work simultaneously?
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模考带练机经题
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If x is a positive integer, what is the remainder when $$x^{2}$$ is divided by 8?
(1)The remainder is 1 when x is divided by 2
(2)The remainder is 2 when x is divided by 3
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190113 还原机经选题: 文字题&几何
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A is 1% saline solution and B is 3% saline solution. How much B solution needs to be mixed with 200g A solution to get 2.5% saline solution?
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190113 还原机经选题: 文字题&几何
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According to the picture, in quadrilateral ABCD, AB//CD，AB=BC=6，∠B=60°，∠D=45°. CD=？
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190113 还原机经选题: 文字题&几何
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According to the picture, the bottom radius of the conical funnel is R and the height is 16. A person pours water into this funnel, and the conical bottom radius of water is r. r/R = 3/4. What is the height of the cone formed by water?
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190113
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There are 16 seats in the first row of a classroom, and each subsequent row has 2 more seats than its previous row. The number of seats in the last row is 64. How many seats are there in this classroom?
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190113
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The equations of two lines are $$y_1$$=$$m_1$$x+$$b_1$$, $$y_2$$=$$m_2$$x+$$b_2$$. $$m_1$$, $$m_2$$, $$b_1$$, and $$b_2$$ are constants. $$m_1$$$$m_2$$$$b_1$$$$b_2$$=？
(1) The x-intercepts of two lines are -2 and 4.
(2) The y-intercepts of two lines are 6 and 4.
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190113 还原机经选题: 文字题&几何
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According to the picture, ABCD is a square. △ADF and △DCE are equilateral triangles. ∠AGF=？
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190113
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According to the picture, ∠ABC=？
(1)D is the center of the circle.
(2)∠CAB=42°
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190113
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The capacity of a tank is 48 m³. It will be injected with water at the speed of 10L/min. How many hours will it take to fill the water tank? (1L=0.001 m³)
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190113
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The linear equation is 4x + 3y-10 = 0. What's the slope of this line?
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