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190215
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How many solutions to equation (x + 1) (x-2) + (x + 1) (x-4) = 0?
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190215 还原机经选题: 数论&代数
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Is n the square of an integer? n is an integer.
1:4n is the square of an integer
2:$$n^{3}$$ is the square of an integer
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191031
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There are three different prices, price B is 10% higher than price A, and price C is 15% lower than price B. What is the ratio of price C to price A?
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190215
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f($$x_0$$)=47000,x=?
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191031
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A number can be divided y 2 ^ 7 * 3 ^ 2 * 5 ^ 4 and 3 ^ 4 * 5 ^ 7 * 11 * 13 at the same time. How many common divisors other than 1 such number has at most ?
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191031
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The probability that event A will occur is 0.6, and the probability that event B will occur is 0.45. What is the probability that both A and B will occur at same time?
1.Such two events are independent of each other.
2.The probability that neither of A and B will occur at the same time is 0.22
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190215
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The size of a playground is shown in the figure. How much longer is the distance around the outer ring of the playground than that around the inner ring?
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190215
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80% of the graduate students in a university is RA, and 60% of them is TA. What is the probability that at least one of the two randomly selected students in the university has at least one identity?
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190215
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5$$x^{2}$$ - 2x - 39=0(x > 0).x=?
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190215
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The two diagonals of the diamond are 10 and 24 in length. What is the circumference of the diamond?
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190215
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$$\frac{2\sqrt{3}-2}{\sqrt{3}-2}$$=?
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190302
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There are four small circles tangent to each other. The small circles are all inscribed in a large circle, as shown in the figure. The radii of small circles are all r. What is the ratio of the side length of the square formed by the line connecting four small circle centers to the diameter of the large circle?
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190302
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△ABC is isosceles triangle. AB = 5, DE = 3. The height of triangle ABC is 3. h=?
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190302
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The first row of the cinema has 16 seats. Each row behind has two more seats than the previous one. There are 64 seats in the last row. How many seats are there in the cinema?
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190302
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How many solutions does the equation |2x-3|=x-5 have?
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190302
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AB=10, ∠A=60°, ∠C=45°. BC=？
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190207
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The average of the three numbers is 15. What's the median?
1: The largest number is twice the smallest one.
2: The sum of the largest number and the smallest number is 30.
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190207
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The salesman's salary consists of a basic salary of $600 and a commission. The commission is calculated as 8% of the amount of these sales that are over $2000. A salesman is paid $840 and $1080 for two months. What is the total sales volume of the two months?
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190215
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The reminder is 1 when n is divided by 4 and the reminder is 2 when n is divided by 3. Which of the following range might n fall into?
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190215
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The range of 9 consecutive positive integers is r. The standard deviation is d, and the average value is m. Which of the following options correctly determines the relationship among r, d, and m?
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