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300难题
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What is the value of x ?
1.$$x^{4} +x^{2}$$ +1=$$\frac{1}{x^{4} +x^{2} +1}$$
2.$$x^{3}+x^{2}$$=0
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Ready4
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What is the greatest prime factor of  ?
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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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Magoosh
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If $$f(x) = x^{2} + 4$$ and f(2k) = 36, then which of the following is one possible value of k?
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$$\frac{(\frac{1}{2})^{-2}}{2^{-2}}$$
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300难题
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If 2x+5y = 8 and 3x = 2y, what is the value of 2x + y ?
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190207
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It took 8 hours for a machine to finish 4/11 of the work. How many more 8 hours will it take to finish the rest of the work?
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A certain list consists of 21 different numbers. If n is in the list and n is 4 times the average (arithmetic mean) of the other 20 numbers in the list, then n is what fraction of the sum of the 21 numbers in the list?
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If the integer k is a multiple of 3, which of the following is also a multiple of 3 ?
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PREP07 Test 1
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In a certain board game, a stack of 48 cards, 8 of which represent shares of stock, are shuffled and then placed face down. If the first 2 cards selected do not represent shares of stock, what is the probability that the third card selected will represent a share of stock?
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PREP07 Test 1
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 As shown in the figure above, a thin conveyor belt 15 feet long is drawn tightly around two circular wheels each 1 foot in diameter. What is the distance, in feet, between the centers of the two wheels?
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PREP07 Test 1
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$$\frac{2^{(4-1)^{2}}}{2^{3-2}}=$$
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Magoosh
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A class consists of 24 students. Which of the following CANNOT be the ratio of the number of girls to the number of boys?
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OG19-数学分册
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A certain company that sells only cars and trucks reported that revenues from car sales in 1997 were down 11 percent from 1996 and revenues from truck sales in 1997 were up 7 percent from 1996. If total revenues from car sales and truck sales in 1997 were up 1 percent from 1996, what is the ratio of revenue from car sales in 1996 to revenue from truck sales in 1996 ?
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OG19-数学分册
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Last year members of a certain professional organization for teachers consisted of teachers from 49 different school districts, with an average (arithmetic mean) of 9.8 schools per district. Last year the average number of teachers at these schools who were members of the organization was 22. Which of the following is closest to the total number of members of the organization last year?
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300难题
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Store N gives a 50 percent discount on the list price of all its items and Store W gives a 60 percent discount on the list price of all its items. If the list price of the same item is 20 percent higher in Store W, what percent (more or less) of the selling price in Store N is the selling price of the item in Store W ?
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300难题
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When 2/9 of the votes on a certain resolution have been counted, 3/4 of those counted are in favor of the resolution. What fraction of the remaining votes must be against the resolution so that the total count will result in a vote of 2 to 1 against the resolution?
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190310 还原机经选题: 文字题&几何 730高分节-数学测试
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54x,y12 is a six digit number. x,y can be 3, 5, or 8. The value of x and y may be the same. What's the probability that the number can be divided by eight?
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190310
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$$A_1B_1C_1D_1$$,$$A_2B_2C_2D_2$$,$$A_3B_3C_3D_3$$are square.$$A_1B_1C_1D_1$$,$$A_2B_2C_2D_2$$are midpoints. What is the ratio of the area of the shaded part to the area of the unshaded part?
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191222
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There are four objects marked 1, 2, 4, 7 in A pocket and other four objects marked 3, 5, 8, and 9 in B pocket. Let's take one object from A pocket and one from B. The probability of A >B is p, and the probability of A
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