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190113 $$(9+\frac{1}{9})^{2}$$-$$(9-\frac{1}{9})^{2}$$=?
190215 g(2)=1,g(n+1)=g(n)+n.g(20）=？
190407 f(x)=$$x^{2}$$$$(1-x)^{2}$$. f(1-x)=?
200301 A square has two circles, one big and one small, which are tangent to each other and are all tangent to the square. The radius is R and r respectively. What is the length of the diagonal of the square?
OG18-数学分册 GMAT、gmat题库、gmat模考、gmat考满分In the rectangular coordinate system above, the area of triangular region RST is
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Given two sets and , if one number is chosen from each set at random, what is the probability that the sum of both the numbers is an even number?
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The sequence such that for all integers . If is a positive integer greater than , is the sum of the first terms of the sequence less than ?

(1)

(2)

190321 Is 3n(n+1) an even number?
1: n is even.
2: $$n^2-1$$ is even.
A jar contains only x black balls and y white balls. One ball is drawn randomly from the jar and is not replaced. A second ball is then drawn randomly from the jar. What is the probability that the first ball drawn is black and the second ball drawn is white?
190302 Is xy > 0？ 1：x-y=1 2：lyl > 2
OG12 OG15 If [x] denotes the greatest integer less than or equal to x, is [x] = 0 ?(1)5x + 1 = 3 + 2x(2)0 < x < 1
OG12 If candy bars that regularly sell for $0.40 each are on sale at two for $0.75, what is the percent reduction in the price of two such candy bars purchased at the sale price?
300难题 Machines X and Y run at different constant rates, and machine X can complete a certain job in 9 hours. Machine X worked on the job alone for the first 3 hours and the two machines, working together, then completed the job in 4 more hours. How many hours would it have taken machine Y, working alone, to complete the entire job?
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For what value of between –4 and 2, inclusive, is the value of the greatest?
If |x - 1| - |x - 2| = 0, then x =?
PREP07 Test 2 $$(-3)^{(-2)} =$$
OG16 OG17 OG18 OG19 OG20 OG2022 What is the value of $${w}^{-2}$$?(1) $${w}^{-1}$$ = $$\frac{1}{2}$$(2) $${w}^{3}$$ = 8
OG18-数学分册 Two numbers differ by 2 and sum to S. Which of the following is the greater of the numbers in terms of S ?
OG19-数学分册 Two numbers differ by 2 and sum to S. Which of the following is the greater of the numbers in terms of S ?
第一期 If r and s are non-zero integers. Is r/s a terminating decimal?
(1)1/r is a terminating decimal.
(2)1/s is a terminating decimal.