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190124
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Is |x| < 1？
1：|x+1|=2|x-1|
2：|x|≠3
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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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190124
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The bottom circumference of a 3 m high cylindrical vessel is 4π$$m^{2}$$ . If the water is poured into the empty container at the speed of 3$$m^{3}$$/s , how long will it take for the water level to reach 1 m?
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200301
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If 457*12=N, then 1 is added to which of the five numbers--4,5,7,1,2 such that difference between the new result and N is more than 2000?
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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 还原机经选题: 文字题&几何
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N employees of a company raised money to buy a gift of X for a former colleague. But in the end, 10 employees quit. How much more must the remaining employees pay on average?
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190302
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$$x^{2}$$+$$y^{2}$$+$$z^{2}$$=16,xy+yz+xz=8,x,y,z > 0 .x+y+z=?
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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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What is the unit digit number of $$5^{5}$$+$$6^{6}$$+$$7^{7}$$+$$8^{8}$$?
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190302
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There are 50 balls in an opaque bag. The numbers of black balls, white balls, red balls and blue balls are 20, 20, 6, and 4, respectively. If two balls are randomly taken out, what is the probability that the two balls have the same color?
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190302 还原机经选题: 数论&代数
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$$d_1$$=$$\sqrt{6^{2}+8^{2}}$$ ，$$d_2$$=$$\sqrt{8^{2}+（6+4\frac{3}{4}）^{2}}$$.Which range does $$d_2$$ - $$d_1$$ fall in?
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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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n=$$2^{5}$$*$$3^{4}$$*$$5^{3}$$*$$7^{2}$$*11 .How many positive factors does n have?
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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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There are three machines in the factory. The machines A, B and, C need 90min, 30min and 15min respectively to produce 80000 sheets of paper. If 3 machines work together, how many minutes does it take to produce 80000 sheets of paper?
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190302
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In the 12 months of 1999, the range of sales was 240. In the 12 months of 2000, the range of sales was 320. What is the minimum range of sales in the 24 months of 1999 and 2000?
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