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190113 还原机经选题: 文字题&几何
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The coordinates of the center of a circle are (10, 6). The radius of the circle is 7. Is point (a, b) in the circle?
(1)5 < a < 13
(2)1 < b < 10
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190113 还原机经选题: 文字题&几何
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Each number in a sequence comes from {10,20,30}. What's the average of this sequence?
(1) 60% of the numbers in this sequence is no more than 20
(2) 80% of the numbers in the sequence is no less than 20
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190113
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Tom, Mary and Bob take the balls randomly in two boxes with no replacement. There are 3 red and 10 white balls in the box A. There are 2 red and 8 white balls in box B. Each of Tom, and Mary takes one ball from one of the boxes before Bob, and do not put balls back. What information is helpful for Bob to determine which box has a high probability of getting red?
(1)Tom takes a red ball in box A, and Mary takes a ball.
(2) Mary takes a red ball in box B, and Tom takes a ball.
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190415
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# is one of the ways of adding, subtracting, multiplying and dividing. What kind of operation does # represent?
1: a*(a#a)=0 is true for any a.
2: a#(b#c)=(a#b)#c
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190415
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Is |2X-Y|=|2Y-X|？
1：X=Y
2：Y > 0
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190415
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MY*CD=12. BX*AC=?
1:BX=3MY
2:AC=5CD
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190321 还原机经选题: 数论&代数
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n is a three-digit number. Is n odd?
1: The sum of the three digits of n is odd.
2: The sum of the hundreds and the unit digit of n is twice of the tens digit.
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190310
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Someone poured 1m^3 of water into a cuboid. What was the height of water in the cuboid?
1: The height of the cuboid is 2m.
2: The length and width of the cuboid are both 4m.
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190124
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Is m > 2?
1:$$\sqrt{m\sqrt{m}\sqrt{2m}}$$ > 2
2:$$\sqrt{2\sqrt{2}\sqrt{2m}}$$ > 2
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200301
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Is (x^2-y)=y？
(1)y(x^2-y)=y^2
(2)xy≠0
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200301
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If x is a real number, is there a solution to the function 5x^2-b = 10?
(1)b>0
(2)b<10
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190302
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|xy|+xy ≤ 0？
1：|x|+xy ≤ 0
2：|y|+xy ≤ 0
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190302
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x=?
1: The greatest common divisor of x and 12250 is 350.
2: The least common multiple of x and 12250 is 24500.
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190302
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y=-|a-x|+b. What is the area of the graph of this function above the x axis?
1：b=4
2：ab=8
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190302
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As shown in the figure, the two circles are concentric. AB is tangent to the small circle. The triangle ABC is an equilateral triangle. What's the difference of the area between the big circle and the small circle?
1: The circumference of the triangle ABC is 24.
2: The area of the triangle ABC is $$16\sqrt{3}$$ .
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190302
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$$x^{2}$$+ax+20=0.a=?
1: The product of the two solutions of the equation is 20.
2: -5 is a solution to the equation.
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190302
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80 < x < 120. The remainder of x divided by 8 is 4. What is the value of x?
1: x can be divided by 9.
2: x can be divided by 12.
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190302
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uv > 0, Is $$u^{2}$$*$$v^{3}$$ > 0
1：u > 0
2：v > 0
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190302
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What is the unit digit of n?
1: The tens digit of $$11^{n}$$ is 4.
2: The tens digit of $$5^{n}$$ is 2.
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190302
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There are 11 numbers in the sequence. What is the median of this series?
1: When the 11 numbers are arranged in order from small to large, the first five numbers are less than 5.
2: When the 11 numbers are arranged in the order of small to large, and the last five numbers are all greater than 5.
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