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OG19-数学分册 $$2x+2y=-4$$ $$4x+ Y= 1$$ In the system of equations above, what is the value of x?
190603
In the following figure, the coordinates of the points in the rectangle are expressed as (x, y). So what is the probability that x+y is less than or equal to 4?
If $${v}\neq{0}$$,is $$ \mid w\mid<\mid v\mid$$?(1)$$\frac{w}{v}<{1}$$(2)$${{w}^{2}\over{v}^{2}}<{1}$$
PREP07 Test 2 Is the positive integer n odd?(1) n = 2k + 1, where k is a positive integer.(2) 2n + 1 is an odd integer.
GWD The passage suggests that which of the following must take place in order for any earthquake to occur? (1)Stress must build up. (2)Cool rock must descend into the mantle. (3)A fracture must occur
OG19-数学分册 A total of 5 liters of gasoline is to be poured into two empty containers with capacities of 2 liters and 6 liters, respectively, such that both containers will be filled to the same percent of their respective capacities. What amount of gasoline, in liters, must be poured into the 6-liter container?
190113 $$x^{3}$$=-3,$$x^{2}$$=?
PREP07 Test 1 For which of the following functions f is f（x） = f（1-x） for all x?
PREP07 Test 2 If x < 0, then $$\sqrt{(-x|x|)}$$ is
PREP07 Test 1 If $$(\frac{1}{5})^{m}(\frac{1}{4})^{18}=\frac{1}{2(10)^{35}}$$, then m =
OG19-数学分册 If $$abc \neq 0$$, is $$\frac{\frac{a}{b}}{c}=\frac{a}{\frac{b}{c}}$$ ? (1) $$a=1$$ (2) $$c= 1$$
OG12 If r is represented by the decimal 0.t5, what is the digit t?(1)$$r<\frac{1}{3}$$(2)$$r<\frac{1}{10}$$
Ready4

Is an integer?

(1)

(2)

190302 $$\frac{1}{n(n+1)}$$-$$\frac{1}{(n+1)(n+2)}$$=$$\frac{2}{n(n+1)(n+2)}$$.$$\frac{2*29}{5*6*7}$$+$$\frac{2*29}{6*7*8}$$+$$\frac{2*29}{7*8*9}$$+......+$$\frac{2*29}{28*29*30}$$=?
191222 There is a set of numbers, in which $$a_0=0$$，$$a_1=1$$，$$a_2=1$$，....，$$a_n=a_{n-1}+a_{n-2}$$，What is the value of $$a_5$$.
Ready4

Is greater than ?

(1) and are consecutive integers

(2) is an odd integer
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Which of the following inequalities is an algebraic expression for the shaded part of the number line above?
Six cards numbered from 1 to 6 are placed in an empty bowl. First one card is drawn and then put back into the bowl; then a second card is drawn. If the cards are drawn at random and if the sum of the numbers on the cards is 8, what is the probability that one of the two cards drawn is numbered 5 ?
OG18-数学分册 Of all the students in a certain dormitory, $$\frac1 2$$ are first-year students and the rest are second-year students. If $$\frac4 5$$ of the first-year students have not declared a major and if the fraction of second-year students who have declared a major is 3 times the fraction of first-year students who have declared a major, what fraction of all the students in the dormitory are second-year students who have not declared a major?
If a code word is defined to be a sequence of different letters chosen from the 10 letters A, B, C, D, E, F, G, H, I, and J, what is the ratio of the number of 5-letter code words to the number of 4-letter code words?