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omnipresent
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truncate
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190124
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There is a stack of cards. 9 cards are blue and the rest are red. The probability of taking out two cards randomly that are both blue is 1/7. What's the number of the red cards?
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190124
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$$(\sqrt{\sqrt{2}}$$+$$\sqrt{\sqrt{8}})^{2}$$ = ?
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190124
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Which of the following lines has only one point, whose x and y coordinates are integers?
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190124
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x and y are two integers between 2-20 (Both boundaries are included.). Do x and y have the same prime factor?
1：x=y+1
2：y is odd.
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190124 还原机经选题: 文字题&几何
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The center of circle O is the coordinate origin. The radius of the circle is 50.p($$x_p$$,$$y_p$$) and Q(50,0) are all on the circle. What is the distance of PQ?
1：$$x_p$$=-30
2：$$y_p$$=-40
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190124
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Does the equation have at least one solution?
1：a > 0
2：c < 0
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190124
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p,s,t are prime numbers. $$p^{3}s^{3}t^{3}$$=？
1：$$p^{3}st$$=728
2：t=13
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190124 还原机经选题: 文字题&几何
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P(A)=0.6, P(B)=0.75. What's the minimum value of P(AB)?
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190124
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$$B_n$$=$$A_{n+1}$$-$$A_n$$,$$B_{n+1}$$-$$B_n$$=2.$$A_10$$=?
1：$$A_1$$=1,$$A_3$$=3
2：$$A_2$$=2,$$A_4$$=4
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190124
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Is n a factor of 30?
1: 30 can be divided by 2n.
2: 30 can be divided by $$n^{2}$$.
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190124
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A cuboid was filled with 10 liters of water. What's the height of the water?
1: The height of the cuboid is 5 m.
2: The box is a cube.
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190124
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A company investigated whether 500 people agree with events A and B. What were the numbers of people who only agree with A, only agree with B, and agree with A and B, respectively?
1: There were 300 people who agree with A.
2: 80 people agreed on both events.
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190124
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4 < $$x^{2}$$ -2x +1 < 16,How many integers x satisfy the inequality?
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190124
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The price of clothes in stores has gone up. Thus, the profit has increased from 15% of the cost to 40%. The cost of clothes does not change. The current price of each cloth is $70. What is the original price?
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190124
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Which of the following options has the largest prime factor?
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190124
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What's the unit digit of $$2^{345}$$+1?
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190124
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Which of the following correctly describes the region that satisfies the inequality group
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190124
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Is $$\frac{x^{2}}{x^{\frac{2}{3}}}$$ ？
1：x > 0
2：x < 1
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