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OG12 OG15
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If $$({x}-{1})^{2}$$ = 400, which of the following could be the value of x - 5 ?
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If $${3}^{6x}=8,100$$, what is the value of $$({3}^{x-1})^{3}$$ ?
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OG18-数学分册
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What is the largest integer n such that $${1}\over{2^{n}}$$ > 0.01?
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OG19-数学分册
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What is the largest integer n such that $$\frac{1}{2^{n}}> 0.01$$ ?
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191020
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What is the value of 1+2+3+4+5+6……+99+100 ？
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Ready4
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The sum of the consecutive odd integers from  to  is equal to  . What is ?
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Ready4
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How many numbers between and  are divisible by either  or  , but not by both?
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Ready4
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If  is an integer and +3 "m=4(n-<font color='#FE8080'>1</font>)+3") , which of the following CANNOT be a divisor of  ?
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Magoosh
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A: {71,73,79,83,87} B:{57,59,61,67}If one number is selected at random from set A, and one number is selected at random from set B, what is the probability that both numbers are prime?
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OG12 OG15 OG16 OG17 OG18 OG19 OG20 OG2022
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if $$s >0$$ and $$\sqrt{\frac{r}S}=s$$,what is r in terms of s ?
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Of the following values of n, the value of $$(-\frac{1}{5})^{-n}$$ will be greatest for n =
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Magoosh
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$$(2\sqrt{3}+\sqrt{5})(2\sqrt{3}-\sqrt{5})$$
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Magoosh
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The system of equations has how many solutions?3x - 6y = 92y - x - 3 = 0
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Three of the four vertices of a rectangle in the xy-coordinate plane are (-3, 10), (2, 10), and (2, 1). What is the fourth vertex?
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The temperatures in degrees Celsius recorded at 6 in the morning in various parts of a certain country were 10°, 5°, -2°, -1°, -5°, and 15°. What is the median of these temperatures?
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190113 还原机经选题: 文字题&几何
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According to the picture, four circles with radius of 1 are tangent to each other. What is the radius of the common circumscribed circle?
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190124
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In sector AOB, ∠O=45°. The radius of the sector is 4. BC is perpendicular to OA. What is the area of the shadow?
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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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How many integers from 0 to 50, inclusive, have a remainder of 1 when divided by 3 ?
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PREP07 Test 1
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If xy = 1, what is the value of $$\frac{{2}^{(x+y)^2}}{{2}^{(x-y)^2}}$$ ?
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