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191020
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Is x^y>1？
(1). x>1
(2). y<1
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181215
|
f(n)=(n+1)*n! , f(n+1)-f(n)=？
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Magoosh
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If $$\frac{1}{x} + \frac{1}{3} + \frac{1}{4} = 1$$, then x =
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Magoosh
|
If 0.25 + x = y and y/x = 0.2, then y =
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191031
|
If a>b>c>0，is c>3？
(1)$$\frac { 1 } { a } > 3$$
(2) $$ \frac { 1 } { a } + \frac { 1 } { b } + \frac { 1 } { c } = 1 $$
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PREP07 Test 1
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If x =$$\frac{1}{2}$$, is y equal to 1 ?
(1) $$y^2(x+\frac{1}{2})=1$$
(2) y ( 2x – 1 ) = 2x - y
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Magoosh
|
$$(5\frac{5}{8})\over(4\frac{1}{2})$$=
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190124
|
{$$x_1$$,$$x_2$$,$$x_3$$,$$x_4$$,$$x_5$$}={-$$\frac{1}{\sqrt{\frac{1}{5}}}$$,$$\frac{-\frac{1}{5}}{\sqrt{\frac{1}{5}}}$$,$$\frac{-1}{\sqrt{\frac{1}{3}}}$$,$$\frac{-\frac{1}{3}}{\sqrt{\frac{1}{3}}}$$,-1}.$$x_1$$ < $$x_2$$ < $$x_3$$ < $$x_4$$ < $$x_5$$,$$x_4$$=?
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181215
|
$$ -1\leq x \leq 0.$$What's the following option arranges the number set {$$x^{-1}$$,$$x^{-2}$$,1,x} in order of small to large?
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190407
|
$$a_n$$=$$a_{n-1}$$ - $$b_{n-1}$$,$$b_n$$=$$a_{n+1}$$ + $$b_{n+1}$$ . $$a_1$$=1,$$a_2$$=2.$$a_4$$=?
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190124
|
Is |x| < 1？
1：|x+1|=2|x-1|
2：|x|≠3
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OG12 OG15 OG16
|
Is rst = 1 ?(1)rs= 1(2)st= 1
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191222
|
$$\frac { 1 \frac { 1 } { 2 } } { 1 \frac { 1 } { 5 } } = x \times \frac { 1 \frac { 1 } { 5 } } { 1 \frac { 1 } { 2 } }$$
,What is the value of x?
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190321
|
$$y = \frac{1}{x^2+1}$$. What is the range?
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181215
|
Both and are positive integers. Is $$(a^{-1}+b^{-1})^{-1}$$ < $$(a^{-1}b^{-1})^{-1}$$?
1：a > b
2：b > $$\frac{1}{2}$$
|
|
Magoosh
|
If four numbers are randomly selected without replacement from set {1, 2, 3, 4}, what is the probability that the four numbers are selected in ascending order?
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|
Magoosh
|
In a group of children, the average (arithmetic mean) weight of the boys is 60 pounds, and the average weight of the girls is 48 pounds. If the average weight of all of the children in the group is 50 pounds, what is the ratio of the number of boys to the number of girls?
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|
OG19-数学分册
|
The price of a certain stock increased by 0.25 of
1 percent on a certain day. By what fraction did the
price of the stock increase that day?
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|
OG12 OG15 OG16
|
 If O is the center of the circle above, what fraction of the circular region is shaded?
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PREP07 Test 1
|
 In the rectangular coordinate system above, the area of △PQR is what fraction of the area of △LMN ?
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