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Manhattan	If n is an integer, f(n) = f(n – 1) – n, and f(4) = 10. What is the value of f(6)?
190321	Someone spent a quarter of his total capital on stock A and the rest on stock B. Stock A is up 8% and stock B is down 4%. What's the percentage increase in total funds?
190207	A(2,8), B(8,-2). What is the abscissa of the point on the x-axis that can make The distance from this point to A is equal to that from this point to B
191031	If $$y = x^2+mx+n$$ has two roots , namely 1 and 2, what's the value of m - n ?
	What is the greatest integer that is less than: -\|3½-3\|?
Ready4	If two different students are to be selected at random from a group of $10$ male and female students, and if $p$ is the probability that one male and one female student will be selected, is $p>\frac{<font color='#FE8080'>1</font>}{3}$ ? (1) More than $\frac{<font color='#FE8080'>1</font>}{2}$ of the $10$ students are female. (2) The probability that both students selected will be female is greater than $\frac{<font color='#FE8080'>1</font>}{3}$ and less than $\frac{<font color='#FE8080'>1</font>}{2}$ .
Ready4	If $x=\tfrac{<font color='#FE8080'>1</font>}{10}+\tfrac{<font color='#FE8080'>1</font>}{12}+\tfrac{<font color='#FE8080'>1</font>}{13}$ $+ \tfrac{<font color='#FE8080'>1</font>}{14}+\tfrac{<font color='#FE8080'>1</font>}{15}$ , then which of the following is true?
OG12 OG15 OG16 OG17 OG18 OG19 OG20 OG2022	For the positive numbers, n, n + 1, n + 2, n + 4, and n + 8, the mean is how much greater than the median
KMFPS	If $$\sqrt{{3}-{2}{x}}=\sqrt{2x}+{1}$$,then $${4}{x}^{2}=$$
190310	x,y are both positive integers.Is x < y? 1.$$\frac{x^2}{xy+x} < 1$$ 2.$$\frac{x^2}{xy-x} < 1$$
Ready4	If $x=<font color='#FE8080'>1</font>-4s$ and $y=3s-<font color='#FE8080'>1</font>$ , then for what value of $s$ does $x=y$ ?
OG19-数学分册	Which of the following lines in the xy-plane does $$\underline {not}$$ contain any point with integers as both coordinates?
Ready4	The ratio 3 to $\frac{1}{4}$ is equal to the ratio
Manhattan	Line A is drawn on a rectangular coordinate plane. If the coordinate pairs (3, 2) and (-1, -2) lie on line A, which of the following coordinate pairs does NOT lie on a line that is perpendicular to line A?
	If $${S}=(\frac{1}{a})*({a}+{b})$$, b = 9 and $${a}=\frac{1}{3}$$, then S =
190113	If is a positive integer, and 16 < $$\frac{(n-1)!n!(n+1)!}{n!}$$ < 17,n=?
Ready4	If the numbers $\frac{<font color='#FE8080'>1</font>}{4}$ , $\frac{3}{8}$ , $\frac{3}{16}$ , $\frac{5}{12}$ , and $\frac{5}{16}$ were ordered from greatest to least, the difference between the greatest and least numbers of the resulting sequence would be
Ready4	Sasha flips a coin 4 times. What is the probability that she will flip exactly 2 heads and 2 tails?
Ready4	A couple decides to have 4 children. If they succeed in having 4 children and each child is equally likely to be a boy or a girl, what is the probability that they will have 1 boy and 3 girls?
190415	S is the total volume of 16 balls whose diameters are 1. C is the volume of 16 cylinders with a diameter of 1 and a height of 1.$$\frac{s}{c}$$=?