190415
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f(x)=ax+b.f(3)=?
1:f(-2)+f(3)=0
2:f(2)+f(-1)=0
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190415
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There are eight points on the plane. Every three points are not on the same line. How many different triangles can be created if 3 of these points are chosen?
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190415
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Both tens and the unit digits of a two-digit number are greater than or equal to 1 and less than or equal to 4. What is the probability that the sum of the digits of this number is a multiple of 3?
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190415 还原机经选题
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ababa is a five-digit integer. Can ababa be divided by 3?
1: a can be divided by 3.
2: b can be divided by 3.
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190415
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What`s the largest prime factor of $$2^{32}$$+$$4^{16}$$+$$8^{8}$$?
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190415
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The radius of $$O_1$$ is R. The radius of $$O_2$$ is r. These two circles are tangent to each other and they are tangent to the quadrilateral ABCD. BD =?
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190415
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190415
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x,y>0,$$\sqrt{x}$$-$$\sqrt{y}$$=?
1:$$\sqrt{x}$$-$$\sqrt{y}$$=8$$\sqrt{xy}$$
2:$$x^{2}$$-$$y^{2}$$=2xy
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190415
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0.0256=?
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190415
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As shown in the figure, there are two semicircles and one circle in rectangle ABCD. The whole circle is tangent to two semicircles. The square EFGH is inscribed to the circle. What is the area of the shaded area?
1: EF=2
2: The area of ABCD is 16.
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190415
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How many more diagonals are there in an octagon than in a heptagon?
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190415 还原机经选题
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a,b,c,d are integers. 1 ≤ a,b,c,d ≤ 9.(a+d)(b+c)=?
1:abcd+dcba=7557.
2:abcd+ dba =1957
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190415
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$$S_2$$+$$S_8$$=?
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190415
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Is the convex quadrilateral a square?
1: The lengths of two diagonals are the same.
2: Two diagonals are perpendicular to each other.
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190415 还原机经选题: 数论&代数
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s,r,t are integers. Is $$\frac{t}{s^{2}}$$ an integer?
1: $$\frac{t}{sr}$$ is an integer.
2: $$\frac{r}{s}$$ is an integer.
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190415
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A pyramid consists of six edges of equal length. The length of each side is 8. What is the total surface area of the pyramid?
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190415
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What is the sum of the interior angles of a heptagon?
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190415
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It takes 12 hours for machine A to make 1200 parts alone. Machine B works at 1/10 of the speed of machine A. How long will it take if B makes 400 parts alone?
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190415 还原机经选题: 数论&代数
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X is formed by inserting two plus signs in 1,2,3,4,5. For example, X=12+34+5=51. Is X odd?
1: X > 100
2: There's a plus sign between 1 and 2.
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190415
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A circle has the same area as a square. What is the ratio of the diagonal of the square to the diameter of the circle?
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