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PREP07 Test 2
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A box contains 25 red blocks, 100 blue blocks, and 175 yellow blocks. What is the probability that a block picked at random from the box will be red?
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190124
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There are three blue balls, five green balls and two red balls in an opaque box. Two balls are taken out randomly. What is the probability that one ball is blue and the other is green?
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What is the value of x?(1).$$\frac{1}{x^2}=\frac{1}{16}$$(2).$$\frac{1}{2}{x}=\frac{1}{8}$$
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OG12 OG15 OG16 OG17 OG18 OG19 OG19 OG20 OG2022
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$$(\frac{1}{2})^{-3}(\frac{1}{4})^{-2}(\frac{1}{16})^{-1}=$$
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($$\sqrt{2}+{1})(\sqrt{2}-{1})(\sqrt{3}+{1})(\sqrt{3}-{1})=$$
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Is |x|+|x-1|=1?(1) $$x \ge 0$$(2)$$ x \le 1$$
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191020
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If $$\frac { 1 } { ( 2 n - 1 ) ! } - \frac { 1 } { ( 2 n + 1 ) ! } = \frac { a n ^ { 2 } + b n + c } { ( 2 n + 1 ) ! }$$, so a+b+c=?
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OG18
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If $$(\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{1}{6}) = r(\frac{1}{9}+\frac{1}{12}+\frac{1}{15}+\frac{1}{18})$$, then r =
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OG19 OG20 OG2022
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If($$\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{1}{6})=r(\frac{1}{9}+\frac{1}{12}+\frac{1}{15}+\frac{1}{18}$$) ,then r=
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Manhattan
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If $$4^{x} + 4^{-x} = 2$$, which of the following is the value of x?
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which of the following is a value of X for which $${X}^{11}-{X}^{3} >{0}$$
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If $$({2}^{x})({2}^{y})={8}$$ and $$({9}^{x})({3}^{y})={81}$$, then (x, y)=
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OG19-数学分册
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If the average (arithmetic mean) of x, y, and z is 7x and $$ x\neq 0$$, what is the ratio of x to the sum of y and z?
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190603
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1/(1-√1/2)=?
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190113
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$$\frac{1-x^{n+1}}{1-x}$$=1+x+$$x^{2}$$+$$x^{3}$$+...+$$x^{n}$$.1+7+$$7^{2}$$+$$7^{3}$$+...+$$7^{8}$$=6725601.$$7^{9}$$=?
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Is |x|+|x-1| = 1 ?(1)x≥0(2)x≤1
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200301
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Seven different points on a circle can be connected to form different polygons. What is the ratio of the number of formed triangles to the number of formed quadrilaterals?
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OG18-数学分册
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Machines A and B always operate independently and at their respective constant rates. When working alone, Machine A can fill a production lot in 5 hours, and Machine B can fill the same lot in x hours. When the two machines operate simultaneously to fill the production lot, it takes them 2 hours to complete the job. What is the value of x ?
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OG12 OG15 OG16 OG17 OG18
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The sum $$\frac{7}{8}+\frac{1}{9}$$ is between
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The sum of the first k positive integers is equal to $$\frac{k(k+1)}{2}$$. What is the sum of the integers from n to m, inclusive, where $$0<{n}<{m}$$?
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