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191020
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The portion of taxable income no more than 10,000 is charged 10%, the portion of (10000, 20000] is charged 15%, and the portion of more than 20,000 is charged 21%. What is the taxable income this month?
(1). The taxes is 9,000 this month
(2). This month's average tax rate is 18%
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191020
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Is x^2 a factor of y^2?
(1)x^3 is a factor of y^3
(2)x^4 is a factor of y^4
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191020
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Is 3b+a odd?
(1)b=3a+3
(2)a-b=odd
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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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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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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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x=?,y=?
1：25$$x^{2}$$-16$$y^{2}$$=161
2：$$x^{2}$$+2xy+$$y^{2}$$=19
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190207
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When a driver runs a long distance, the boss will pay her $10 / h and $0.5/mile. She received a total of $100. How many miles did she drive this time?
1: The average speed is 50mile/h
2: She ran 5/12 of the way at 58 mile/h. The average speed of the rest of the journey was 39 mile/h.
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190207
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Is the area of a circle larger than that of a square?
1: The circumference of a circle is greater than the circumference of a square.
2: The diameter of the circle is larger than the side length of the square.
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190603 还原机经选题: 数论&代数
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As shown in the figure, A splices squares with matches, and 3 matches will be used for each additional square, which will be marked as an S; B uses matches to splice geometric figures on the basis of trapezoids, and 2 matches will be used for each additional geometric figure, which will be marked as a T. A spliced n additional squares, b spliced m additional geometric figures. What is the value of m?
(1)n = m
(2)Two people have used the same number of matches
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190603
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A set S consists of consecutive integers. How many even numbers are included in the set S?
(1). Set S has 34 odd numbers
(2). Set S has 68 even numbers
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190207
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x+y=120, x+z=100. What is the value of x ？
1：x+y+z=160
2：y+z=100
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190207
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The radius of the circle O is r. AO is perpendicular to OB. What is the area of the shaded part?
1：∠BAC = 30°
2：∠CAO = 30°
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191020
|
The triangle ABC is a right-angled triangle, and B is the right angle. If a point D is on AC, is the triangle BCD an isosceles triangle?
(1) BD = AD
(2) D is the midpoint of AC
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191020
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X^4-X^3+X^2-X>0?
(1)X^4>X^2
(2)X<0
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191020
|
There are less than 50 books. If 7 books are packed into a box, one book will be left. How many books are there?
(1) If 9 books are packed into a box, 7 books will be left
(2) If 4 books are packed into a box, 3 books will be left
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190215
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In rectangular coordinate system, ABC is a right triangle. AC is perpendicular to BC. What is the abscissa of C?
1：A(10,5)
2：B(0.5,2)
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190215
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1：B∩A=C
2：D∪A=X
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