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190113
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Is the positive integer p the sum of the square of two integers?
(1) p is prime.
(2) p=4y+1. y is an integer and 0 < y < 5.
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190113
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The sequence $$a_1$$,$$a_2$$,......$$a_n$$ , such that $$a_3$$=$$a_1$$+$$a_2$$,$$a_4$$=$$a_1$$+$$a_2$$+$$a_3$$,$$a_n$$=$$a_1$$+$$a_2$$+......+$$a_{n-1}$$.If $$a_n$$=p,what is the value of $$a_{n+2}$$.when n is greater than 2?
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190113
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Is the average of r, s, and t equal to their median?
(1) The average of r, s, and t is s.
(2) r < s < t
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190603
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E, J, R and V take an exam and the total score of these four people is 400. What is the relationship between the score of J and the score of R?
(1) E+J=R+V+100
(2) E+R=J+V-80
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190113
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Is x a negative number?
(1) $$x^{3}$$ < $$x^{2}$$
(2) $$x^{3}$$ < $$x^{4}$$
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190113
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The cost of a commodity is $12.50, and the wholesale price is $17. The retail price is 50% higher than the wholesale price. How much is the retail price higher than the cost price?
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190113
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What's the circumference of the circle whose area is $$\frac{9π}{4}$$ ?
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190113
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An opaque bag contains 50 balls in only two colors, red and white. Remove 2 balls from the bag one by one without replacement. What is the total number of white balls in the bag?
(1)The probability of taking out the white ball for the first time is $$\frac{1}{5}$$.
(2)The probability that the ball taken out are both red is $$\frac{156}{245}$$.
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190113
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If positive integer k is larger than 1. Is $$\frac{k}{3}$$ an integer?
(1)$$\frac{12}{k}$$ is an integer.
(2)$$\frac{81}{k}$$ is an integer.
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190113 还原机经选题: 文字题&几何
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The total ride was 30 miles. What was the average speed?
(1) The average speed of the first 20 miles was 20 miles / h
(2) The average speed of the last 20 miles was 30 miles / h
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190113
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What's the unit number of a positive integer n?
(1)The tens digit of $$11^{n}$$ is 4.
(2)The hundreds digit of $$5^{n}$$ is 6.
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190207
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Is xy-z > x-yz？
1：y > 1
2：x > 0
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190113
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x=a$$\sqrt{b}$$, y=c$$\sqrt{d}$$. If a, b, c and d are positive integers, and x and y are not integers. Is xy an integer?
(1) $$\sqrt{ad}$$ is an integer.
(2) $$\sqrt{bc}$$ is an integer.
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190113
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The radius of a circle is 10. The area of the sector(fan-shaped) whose center angle is x is A. Which of the following formulas can express A in terms of x?
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190113
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The size range of a batch of parts is 2.5±0.03 mm. One of these parts is randomly selected, and the size of the part is k. Which inequality does k satisfy?
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190113 还原机经选题: 文字题&几何
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Bob invests $1000 in two investments, A and B, whose simple interest rates are 6% and 8%, respectively. If Bob invests them for both 1 year, how much does he invest in investment A?
(1) The total interest he gets is $74.
(2) The interest of A is $38 less than that of B.
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190113 还原机经选题: 文字题&几何
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z=x/y. If x and y are increased by 40% and 25%, respectively, by what percent is z increases?
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190113 还原机经选题: 文字题&几何
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There are 50 balls of the same size and texture in a bag, including 20 red balls, 20 green balls, 6 purple balls and 4 black balls. The probability that a ball is selected randomly from the bag is equal. If Two balls were chosen randomly from the 50 balls in one time, what is the probability that these two balls are of the same color?
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190113
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If x+y=z, what is the value of y?
(1)y=x+z
(2)x=y+z
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190113
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|2x-3| > 6 is equivalent to which of the following options?
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