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OG12 OG15 OG16 OG17 OG18 The sum $$\frac{7}{8}+\frac{1}{9}$$ is between
181215 Which of the following options has the same standard deviation as a,b,c?
200301 还原机经选题: 数论&代数 If s = 1/(1+2+3+4)+1/(1+2+3+4+5)+...+1/(1+2+3+...+98+99), what`s the range of s?
191020 $$\frac { 1 } { 1 + 2 + 3 + 4 } + \frac { 1 } { 1 + 2 + 3 + 4 + 5 } + \ldots \ldots \frac { 1 } { 1 + 2 + 3 + \ldots + 99 } = ?$$
190113 If x+y=u, and x-y=v, xy=?
Magoosh Which of the following is equivalent to$${2x^2+8x-24}\over{2x^2+20x-48}$$ for all values of x for which both expressions are defined?
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?
190124 y=x+$$\frac{1}{x}$$-1(x≠0) .How to express x with y?
190215 (n+1)(n+2)(n+3)(n+4)=?
Ready4

In the xy-plane, what is the slope of the line with equation 4x+5y=6 ?
191020 If 4^4^4=2^2^x, what is the value of x ?
Ready4

If 0.016* 10 n 0.4* 10 m =4* 10 4 , then m−n=
190124 A person bought a packet of candies. He ate $$\frac{1}{3}$$ of all of the candies. Then, he ate $$\frac{1}{3}$$ of the left ones. What`s the ratio of the number of candies in the packet after eating to that of all of the candies?
190321 $$\frac{ \sqrt{5} + \sqrt{3}}{ \sqrt{5} - \sqrt{3}}$$=?
190310 $$(9^{900}+3^{1800})^2$$ =?
190215 If a coin is even, and the possibility of the occurrence of showing the head and the tail are equal. What is the probability that the head shows up at least one time?
191222 There are ten cards marked with the numbers from 1 to 10 respectively. Draw two out of ten cards and never put them back. What's the probability that the sum of the two numbers on the two cards drawn is less than the average of the ten cards?
190302 The length of the three sides of a triangle is 6, x, 2x. What is the range of x?
190113 还原机经选题: 文字题&几何 There are 64 identical cubes with side of 1. Only one face of each cube is painted. These 64 cubes will be put together into a big cube. What's the maximum proportion of painted sides on the surface of this big cube?
OG17 If an integer n is to be chosen at random from the integers 1 to 96, inclusive, what is the probability that n(n + 1)(n + 2) will be divisible by 8?