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190215 $$\frac{1}{10^{n+1}}$$ < 0.00068 < $$\frac{1}{10^{n}}$$ .n=?
190113 $$\frac{1}{n(n-1)}$$-$$\frac{1}{(n-1)(n-2)}$$=$$\frac{2}{n(n-1)(n-2)}$$,$$\frac{ab}{4*5*6}$$+$$\frac{ab}{5*6*7}$$+...+$$\frac{ab}{19*20*21}$$=?
If a, b, and c are positive integers, with a< b< c on secutive c and b, a, are >(1)$$\frac{1}{a}-\frac{1}{b}=\frac{1}{c}$$(2)$${a}+{c}={b}^{2}-{1}$$
OG18 OG19 OG20 OG2022 If p $$\neq 0$$ and $$p - \frac{1-p^{2}}{p} = \frac{r}{p}$$, then r =
OG18 OG19 OG20 OG2022 If x and y are positive numbers, is $$\frac{x+1}{y+1}>\frac{x}{y}$$?(1) $$x>1$$(2) $$x\lt y$$
If $${{1}\over{x+2}}={{1}\over{x-2}}+{{1}\over{x+1}}$$, which of the following is a possible value of x?
190310 $$(x^2+2x+1)(x^2-2x+1)=x^4+1$$.x=?
190407 $$\frac{4}{(\sqrt{5}-1)(\sqrt{5}+1)}$$=?
Magoosh $$（{{3}^{-1}-2^{-1}}）^{-1}$$
191222 $$\frac { x + 1 } { 1 - x } > 0 ?$$
(1)x>0
(2)x<1
Ready4

If  and , then

OG16 OG17 OG18 OG19 OG20 OG2022 GMAT、gmat题库、gmat模考、gmat考满分The parallelogram shown has four sides of equal length. What is the ratio of the length of the shorter diagonal to the length of the longer diagonal?
Ready4

According to the chart shown, which of the following is closest to the median monthly sales, in dollars, at a local coffee shop over the time period from September to June, inclusive?
Magoosh 0.000125 =
OG18-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?
A gardener is going to plant 2 red rosebushes and 2 white rosebushes. If the gardener is to select each of the bushes at random, one at a time, and plant them in a row, what is the probabilitythatthe2 rosebushes in the middle of the row will be the red rosebushes?
If x + y + z = 0, x + 2y + 3z = 0, and $$y \neq 0$$, then $$\frac{x}{y}$$ =
GMAT、gmat题库、gmat模考、gmat考满分The figure shows two squares, and the points W, X, Y, and Z lie on a line. If the distance between W and X is equal to the distance between X and Y and to the distance between Y and Z, then the area of the smaller square is what fraction of the area of the larger square?
PREP07 Test 1 Alice's take-home pay last year was the same each month, and she saved the same fraction of her take-home pay each month. The total amount of money that she had saved at the end of the year was 3 times the amount of that portion of her monthly take-home pay that she did not save. If all the money that she saved last year was from her take-home pay, what fraction of her take-home pay did she save each month?
OG21 OG2022 If z≠o and z + $$\frac{1-2z^{2}}{z}$$=$$\frac{w}{z}$$，then ω=