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181215
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($$\frac{1}{2} - \frac{1}{3}$$)+($$\frac{1}{3} - \frac{1}{4}$$)+($$\frac{1}{4} - \frac{1}{5}$$)=?
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300难题
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The figure above shows 2 circles. The lager circle has center A, radius R cm, and is inscribed in a square. The smaller circle has center C, radius r cm, and is tangent to the larger circle at point B and to the square at points D and F. If points A, B,C,and E are collinear, which of the following is equal to $$\frac{R}{r}$$?
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第一期
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$$S_{1}=1$$,$$S_{2}=2$$,$$S_{3}=(S_{2})^{S_{1}}=2^{1}=2$$,$$S_{n}=(S_{n-1})^{S_{n-2}}$$,$$\frac{S_{6}}{S_{5}}=$$
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181215
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-1 < x < 0. Please arrange $$x^{-1}$$,$$x^{-2}$$,x,1 from small to large
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The operation $$\Delta$$ is defined for all nonzero x and y by $${x}\Delta{y}={x}+\frac x y$$. If $$a > 0$$, then $$1\Delta (1\Delta a) =$$
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$$\frac{1}{3}+\frac{1}{2}-\frac{5}{6}+\frac{1}{5}+\frac{1}{4}-\frac{9}{20}$$ =
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Is | x |<1?(1) | x + 1 | = 2 | x - 1 |(2) $$| x - 3 | \neq 0$$
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OG16 OG17 OG18 OG19
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$$\frac{1}{3}+\frac{1}{2}-\frac{5}{6}+\frac{1}{5}+\frac{1}{4}-\frac{9}{20}=$$
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191020
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$$ \left( \frac { 1 - 10 ^ { 100 } } { 1 + 10 ^ { 50 } } \right) \left( \frac { 1 - 10 ^ { 50 } } { 1 - 10 ^ { 50 } } \right) = ? $$
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Manhattan
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If $$2^{2x – 1} = 8^{y}$$ then x in terms of y equals:
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190113
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When -1< x < -3/4, which option has the maximum value?
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If –1 < h < 0, which of the following has the greatest value?
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If xy > 0, does (x -1)(y - 1) = 1?(1) x + y = xy(2) x = y
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PREP07 Test 1
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Is $${(x+1)\over(x-3)}<0$$?(1) -1 < x < 1(2) $$x^2 - 4 < 0$$
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Magoosh
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What is the value of $${1}\over{x + 4}?$$Statement #1: 4.375x – 6.25 = 11.25Statement #2:$${{1}\over{x+8}}-\frac{1}{48}=\frac{1}{16}$$
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If $$xy \neq 0$$, what is the value of $${{1}\over{x}}+{{1}\over{y}}$$ ?(1) $${{1}\over{(x+y)}}=-1$$(2) $$xy=6(x+y)$$
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190113 还原机经选题: 数论&代数
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(($$\frac{1}{3})^{2}+\frac{1}{3}*\frac{1}{4}$$)*(($$\frac{1}{3})^{2}-\frac{1}{3}*\frac{1}{4}$$)=?
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Magoosh
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If the ratio of the volume of cube A to the volume of cube B is 1 to 8, what is the ratio of the surface area of cube A to the surface area of cube B?
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190124
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y=x+$$\frac{1}{x}$$-1(x≠0) .How to express x with y?
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191031 还原机经选题: 数论&代数
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If$$ a_1=1$$，$$a_n=-1/[(a_{n-1})+1]$$，then what's the value of $$a_{2012}$$？
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