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181215
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$$(\frac{1}{125})^{x}$$=$$625^{y}$$, $$\frac{x}{y}$$=?
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181215
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Which of the following options meet the condition that there is a common factor greater than 1 between each two numbers, and there is no common factor greater than 1 between the three numbers?
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181215
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Both and are positive integers. Is $$(a^{-1}+b^{-1})^{-1}$$ < $$(a^{-1}b^{-1})^{-1}$$?
1：a > b
2：b > $$\frac{1}{2}$$
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181215
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$$ -1\leq x \leq 0.$$What's the following option arranges the number set {$$x^{-1}$$,$$x^{-2}$$,1,x} in order of small to large?
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181215
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Line L goes through (r,s). Is r > s?
1: r > 0
2: The slope of is negative.
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181215
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Last year, the price of a commodity was 12% higher than the cost. This year, the price is 247 dollars, which is 30% higher than the cost. The cost is the same in these two years. What's the price of the commodity last year?
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181215
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The budget for someone's meal is $6 plus 5% tax. In fact, he only spent $5.67. How many percents is the actual cost less than the budget?
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190124
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{v,w,x,y,z}={2,3,4,8,9}. What is the possible value of $$\frac{\frac{vw}{y}}{\frac{x}{z}}$$?
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190124
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N is divisible by 5. what is N?
1：When N is divided by 4, the remainder is 3.
2：N is divisible by 3.
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190124
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A person bought a packet of candies. He ate $$\frac{1}{3}$$ of all of the candies. Then, he ate $$\frac{1}{3}$$ of the left ones. What's the ratio of the number of candies in the packet after eating to that of all of the candies?
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190124 还原机经选题: 文字题&几何
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The distance between the point (x,0) and (-1,3) equals to that between (x,0) and (8,4). x=?
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190124
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Among 200 people, 70 eat oranges and 90 eat apples. The number of people who eat neither oranges nor apples is twice as that who eat both. How many people who don't eat oranges or apples?
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190124
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A takes 4 hours to complete a task alone. It takes 3 hours for A and B to finish the task at the same time. How many hours does it take for B to finish the task alone?
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190124
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y=x+$$\frac{1}{x}$$-1(x≠0) .How to express x with y?
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190124
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A positive integer N is a multiple of 5. What is the remainder of N divided by 6?
1: When N is divided by 4, the remainder is 3.
2: When N is divided by 12, the remainder is 3.
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第一期
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Square tiles with size 9*9 $$inch^{2}$$ of each are applied to rectangular floors of size 18*12 $$feet^{2}$$. How many tiles are needed to cover the rectangular floor? (1 feet = 12 inch)
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第一期
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According to the picture, there are three identical circles that are tangent. Triangle ABC is an equilateral triangle, and A, B and C are all centers of circles. The radii of circles A, B, and C are all 10. What is the length of the arcs in black?
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第一期
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Two drivers, A and B, drive at their respectively constant speed on the same road. At a certain time, the distance between A and B is 10miles. How long does it take B to catch up with A from that time?
(1)A is 10mph slower than the highest speed while B is 10mph faster than the highest speed
(2)B is driving speed 65mph.
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第一期
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There are 20 cars in a taxi company. The number of blue cars is greater than 10. The rest are exactly red and green cars, and the number of cars of each colors is greater than 0. How many are there in green?
(1) The number of green cars is five times that of red cars.
(2) The total number of green cars and red cars is 6.
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第一期
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Three bags, A, B, and C, contain balls of the same size. There are 9 white balls and 1 green ball in A. There are 8 white balls and 2 green balls in B. There are 7 white balls and 3 green balls in C. Only one ball is taken randomly from each bag. What's the probability of taking at least one white ball?
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