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190215
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The relationship between the height h of the ball and the time t satisfies h(t)=-5$$t^{2}$$+$$v_0$$t . The initial velocity $$v_0$$ is 36 m/ s. How long does it take for the ball to return to its initial height?
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190215 还原机经选题: 数论&代数
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5 days from today is Tuesday, when is 100 days from today?
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190215
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The probability of occurrence of event A is X. The probability of occurrence of event B is Y, and the probability of simultaneous occurrence of events A and B is Z. A. What is the probability of the occurrence of at least one event?
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191031
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A has worked for 18 hours and B has worked for 6 hours. A is three times more efficient than B. So , what the fraction of (A + B) 's total workload is B's total workload ?
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190215
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Is 3 a factor of 25*$$10^{n}$$*$$x^{10^{2n}}$$?
1：n=2
2：x=17
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190215
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The distribution of students' scores is shown in the table. What is the median score of these students?
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191031
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ABCE and AFCD are two rectangles, E is on FD, AB = 1, BC = 2, What is the area of rectangular AFDC.
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190215
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It will take 6 hours for machine A to finish a task. If machine A and machine B work at the same time, can they finish the same task in 3 hours?
1: Machine B is twice as efficient as machine A.
2: The efficiency of machine B is higher than that of machine A.
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191031
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It is given that： 2 / k + 4 / m = r / s, where r / s is the fraction in lowest term,
Is s = km?
1. k and m are prime numbers
2. k and m have no common factors except 1.
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190215
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There are 30 objects of various colors and shapes in a bag. An object will be taken out randomly from the bag. What is the probability that the object is red or cube?
1: There are 5 cubes and 8 red objects in the bag.
2: There are three red cubes in the bag.
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190215
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$$\frac{1}{10^{n+1}}$$ < 0.00068 < $$\frac{1}{10^{n}}$$ .n=?
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190215
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x > 0,y < 0,z > 0.$$|x+y+z|^{2}$$=?
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190302
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The cinema was supposed to sell 10 adult tickets and 20 children's tickets. Tickets for adults and children were sold $25 and $10, respectively. A total of $300 tickets were not sold before the film started. 4 adult tickets were sold. How many children tickets were sold?
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190302
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The denominations are different while the thickness is the same. The total value of $10000 of $20 banknotes is 35feet10inches. What is the height of the total value of $6000000000 of $50 banknotes? (1feet=12inches)
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190207
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(n-1)*n!+(n-1)!*n=?
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190207
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What is the sum of all four-digit numbers that can be composed of 1,2,3,4?
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190207
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c is a mixture of a and b. The unit price of c is $3.2/kg. What is the value of a/b=?
（The price is proportional to the unit）
1: The unit price of a is $2 / kg.
2: The unit price of b is $4 / kg.
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190207
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A(2,8), B(8,-2). What is the abscissa of the point on the x-axis that can make The distance from this point to A is equal to that from this point to B
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190207
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One machine can complete 800 units of work in 2.5 hours. How many machines can complete 7200 units of work in 8 hours?
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190207
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x=?,y=?
1：25$$x^{2}$$-16$$y^{2}$$=161
2：$$x^{2}$$+2xy+$$y^{2}$$=19
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