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200301
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How many diagonals does an octagon have more than a heptagon?
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200301
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Is the quadrilateral a square?
(1). the diagonals of the quadrilateral are perpendicular
(2). the diagonals of the quadrilateral are equal
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200301
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What is the sum of the angles of a heptagon？
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200301
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There is a rectangular box, with a length of 4, a width of 4, and a height of 1. At present, there are two kinds of small packages: spherical packaging boxes and cylindrical packaging boxes. (1) 16 identical spherical packaging boxes with a diameter of 1 can be contained in this rectangular box. (2) 16 identical cylindrical packaging boxes with a bottom-circle diameter of 1 and a height of 1 can be contained in this rectangular box. Assume that the space ratio of 16 small spherical boxes in this rectangular box is S, and the space ratio of 16 small cylindrical boxes in this rectangular box is C. Which of the following can correctly represent the relationship between S and C?
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200301
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The ratio of zinc and copper in X is 5: 7, and the ratio of zinc and copper in Y is 8: 7. After mixing the same amount of X and Y, what is the ratio of zinc and copper in the new mixture？
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200301
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ABCD is a square. According to the picture below, what is the area of EMHN?
(1) Perimeter of ABCD is 48
(2) Area of ABCD is 144
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200301
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The sequence $$a_1$$,$$a_2$$......$$a_n$$, such that $$a_1=3$$,$$a_2 = 5$$,$$a_3 = a_1 +a_2$$,$$a_4 = a_1+a_2+a_3$$,$$a_n=a_1+a_2+$$...+$$a_{n-1}$$. What is the ratio of $$a_{24}$$ to $$a_{20}$$?
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200301
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As shown in the figure, ABCD is a square, and ABE is an equilateral triangle. What is the measurement degree of x?
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200301
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Is positive integer x a sum of squares of three different positive integers?
(1)x < 29
(2)x is divisible by 7
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200301
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Arrange six letters h,t,l,a,o,s in a row, among which the letters in the first, second and fourth positions can only be selected from the three letters--h,t,l. How many arrangements are there?
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200301
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Is n a multiple of 25?
(1)n is a multiple of 5
(2)n is the square of an integer
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200301 还原机经选题: 数论&代数
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If s = 1/(1+2+3+4)+1/(1+2+3+4+5)+...+1/(1+2+3+...+98+99), what's the range of s?
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200301
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What is the maximum number of the points of intersection of a circle and a square？
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200301 还原机经选题: 数论&代数
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What's the reminder when $$9^{581}$$ is divided by 10?
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190302
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x=$$\sqrt{3}$$+$$\sqrt{7}$$.x+$$\frac{1}{x}$$=?
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190302
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0.62576257… is a limited repeating decimal (6257 repeats). What is the number of the 987th digit？
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190302
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$$\frac{b}{a}$$ - $$\frac{a}{b}$$=0.Which of the following option must be true?
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190302
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$$\frac{a}{b}$$+$$\frac{b}{a}$$=2. Which of the following option must be true？
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190302
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AB//CD. ∠BAD=45°, ∠BCD=60°, BC=CD=6. AB=?
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190302
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BC is perpendicular to AB. AC=2600, $$\frac{BC}{AB}$$=$$\frac{5}{12}$$, BC=？
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