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190321 还原机经选题: 文字题&几何
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Mary invested some money in a certificate of deposit that earns interest at an annual rate of x percent compounded semi-annually. At the end of the first half-year, the amount in the certificate is $2060. At the end of the second half-year, the amount in the certificate is $2121.8. What is the annual interest rate on this certificate?
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190321
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Two boys and three girls will be arranged in a row. If boys and girls alternate, how many queuing methods are there?
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190321
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How many factors are there in 60?
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190321
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$$(x+y)^2-(x-y)^2=27$$.xy=?
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190321
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$$a_1=45$$,$$a_2=49$$,$$a_n=a_{n-2}+7(n \geq 3) $$. Which of the following option is in the sequence{$$a_n$$} ?
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190321
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After someone deposited r dollars in his account, the balance was t dollars. Then, he spent a third of his balance on purchases. How much was the balance of his account after consumption?
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190321
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Is $$x^4
1:$$x^4
2.$$x^3 < y^4$$
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190321
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Someone spent a quarter of his total capital on stock A and the rest on stock B. Stock A is up 8% and stock B is down 4%. What's the percentage increase in total funds?
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190321
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One fruit store sold 140 apples in five days, at least 15 apples in a day. How many apples can this fruit store sell at most in a day?
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190321
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In a rectangular coordinate system, lines r and h both pass through the point (1,-1). The product of the slope of line r and line h is -1. The x-intercept of line r is 3. What is the coordinate of the intersection of line h with the x-axis?
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190321
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x,y are positive integers. x>y. Is $$x^{y-1}$$ odd?
1: x-y is even.
2: x+y is even.
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190321
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It takes 4 hours for three machines A,B and C to produce 10,000 masks. It takes machine A 10h to produce 10,000 masks alone. It takes machine B 8h to produce 10,000 masks alone. If C works alone, how long will it take to produce 10,000 masks?
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190321
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The cost of each table is $50. The cost of each chair is $5. The profit of the table is 30% of the cost. The profit of the chair is 50% of the cost. A furniture store sold five times as many chairs as tables. The total profit on tables and chairs was $550. What's the total cost price of the tables and chairs sold?
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190321
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The units digit of $$(x+1)^3$$ and $$(x+3)^3$$ are 1. What`s the units digit number of $$(x-3)^3$$?
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190321
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S={0.1,0.01,0.001,0.0001,0.00001}. How many different results of the sum of n ($$n \geq 2$$) numbers can be achieved if the number are taken out from the set S?
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190321
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If $10,000 are deposited in the bank, then after one year, the sum of principal and interest is $1,0004. If someone deposits $25,450 in the bank, with the same interest rate, how much interest will that person get in a year?
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190321
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The equation of line $$l_1$$ is ax+by+c=0. Line $$l_2$$ is perpendicular to line $$l_1$$. The line $$l_2$$goes through the point (2c,0). Which of the following is the equation of line $$l_2$$?
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190321
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[x] represents the integer that is not larger than x. Is [2d] equal to zero?
1:[d]=0
2:[3d]=0
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190321
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$$y = \frac{1}{x^2+1}$$. What is the range?
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190321
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The set S consists of n consecutive integers. The minimum in S is 3. n =?
1: The mean is 6.
2: The range is equal to the mean.
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