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$$\frac{594}{625}$$
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OG18
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$${{1}\over{1+\frac{1}{3}}} -{{1}\over{1+\frac{1}{2}}}$$
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OG12 OG15 OG16 OG17
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$$\frac{1}{({1}+\frac{1}{3})}-\frac{1}{(1+\frac{1}{2})}=$$
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OG19 OG20 OG2022
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$$(\frac{1}{2}-\frac{1}{3})+(\frac{1}{3}-\frac{1}{4})+(\frac{1}{4}-\frac{1}{5})+(\frac{1}{5}-\frac{1}{6})$$
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190321
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The portion of the iceberg that is out of the water accounts for 1/8~1/7 of the total volume of the iceberg. What is the ratio of the part of the iceberg above the water to the part below the water?
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PREP07 Test 2
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If $$k \neq 0, 1, or -1$$, is $$ \frac{1}{k}$$ > 0 ?(1)$$ {1\over{(k-1)}} > 0$$(2)$$ {1\over{(k+1)}} > 0$$
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191020
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$$\frac { 1 } { 1 + 2 + 3 + 4 } + \frac { 1 } { 1 + 2 + 3 + 4 + 5 } + \ldots \ldots \frac { 1 } { 1 + 2 + 3 + \ldots + 99 } = ?$$
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190415
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$$\frac{1}{n}$$ < $$\frac{1}{31}$$ < $$\frac{1}{32}$$ < $$\frac{1}{33}$$ < $$\frac{1}{n-1}$$.n=?
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191222
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1/(n+1)<1/31+1/32+1/33<1/n，what is the value of n？
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OG19 OG20 OG2022
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If S=1+$$\frac{1}{2^{2}}+\frac{1}{3^{2}}+\frac{1}{4^{2}}+\frac{1}{5^{2}}+\frac{1}{6^{2}}+\frac{1}{7^{2}}+\frac{1}{8^{2}}+\frac{1}{9^{2}}+\frac{1}{10^{2}}$$, which of the
following is true?
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All the following have the same value EXCEPT
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A right circular cone is inscribed in a hemisphere so that the base of the cone coincides with the base of the hemisphere. What is the ratio of the height of the cone to the radius of the hemisphere?
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Magoosh
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If the areas of the 4 squares are 50, 32, 18 and 12, what is the ratio of the small shaded portion to the area of the large shaded portion?Note: Figure not drawn to scale
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模考带练机经题
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$$\frac{(1+\frac{1}{2})}{(1+\frac{1}{5})}$$ = x*$$\frac{1+\frac{1}{5})}{(1+\frac{1}{2})}$$
What is the value of x?
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190302
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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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The operation □ is defined for all a and b by a □ b = a + b+ ab, If a□b = 0 and b≠-1, what is a in terms of b?
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KMFDS
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If a and b are positive, is $$(a^{-1}+b^{-1})^{-1}$$ less than $$(a^{-1}*b^{-1})^{-1}$$?(1)$$a = 2b$$(2)$$a + b > 1$$
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OG12 OG15 OG16
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A straight pipe 1 yard in length was marked off in fourths and also in thirds. If the pipe was then cut into separate pieces at each of these markings, which of the following gives all the different lengths of the pieces, in fractions of a yard?
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OG12 OG15 OG16 OG17
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$${(\frac{x+1}{x-1})}^{2}$$If $${x}\neq{0}$$ and $${x}\neq{1}$$, and if x is replaced by $$\frac{1}{x}$$ everywhere in the expression above, then the resulting expression is equivalent to
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OG18-数学分册
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If S is the sum of the reciprocals of the 10 consecutive integers from 21 to 30, then S is between which of the following two fractions?
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