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191020	What's the value of $$\left( 900 ^ { 900 } + 30 ^ { 1800 } \right) ^ { 2 } $$?
191020	There are less than 50 books. If 7 books are packed into a box, one book will be left. How many books are there? (1) If 9 books are packed into a box, 7 books will be left (2) If 4 books are packed into a box, 3 books will be left
191020	If $$x^3=-3$$, which of the following is the value of x2?
191020	M and n are positive integers, and they are all factors of p, is p=mn? (1)p ≤ mn (2)The greatest common factor of m and n is 1
191020	A company sells 10,000 commodities a month and each commodity is sold for 50 yuan. The fixed cost of these commodities is 300,000 yuan. The variable cost is 10 yuan per commodity. How much more proportion of commodities does the company sell can make a double profit?
191020	As shown in the figure, after folding the triangle ACE，what's the ratio of AF to EF?
191020	It will take 20 minutes for A, B, C together to complete a task. A will need 240 minutes if he works alone. B will need 40 minutes if he works alone. How long will it take for C to complete this task alone?
191020	3 boys and 3 girls stand in a row. If no boy stands between girls and no girl stands between boys, how many arrangements are there?
191020	How many factors of 210 are both greater than 1 and odd numbers?
191020	If x and y are integers, and $$x^2+y^2 = 25$$, xy=12, how many possible values of x+y?
191020	The population of S city round to 10,000 is 140,000; The population of M city round to 10,000 is 80,000. What is the sum of the population of S city and M city if the sum is rounded to 10,000? (1)Two figures are rounded within 2% of the original number; (2)The population of S city is upward when it is rounded, while the population of M city is downward when it is rounded
191020	$$x=a \sqrt{b}$$,$$y=c \sqrt{d}$$,neither x nor y is integer,is $$\sqrt{xy}$$ integer? (1)$$\sqrt{xy}$$ is an integer (2) is an integer
191020	As shown in the figure, what's the area of △DBC?
191020	A fair coin is tossed twice,what's the probability of getting at least one head?
191020	P and q are two prime numbers, how many factors does pqⁿ have? (1)p = 3, q=7 (2)n = 2
191020	Is \|x-y+z\|>\|x+y-z\|? (1)x (2)x=0
191020	A person buys a commodity for 120$, and sells it at a 20% discount of the original sell price. The profit is 48$. What is the original sell price?
191020	The company given a survey about the number of employees participating in meeting and picnic. 70 people participated in both and 120 people participated in only one. There were 50 more people participating in meeting than in picnic. How many people participated in meeting?
191020	As shown in the figure, a semicircle is spliced with a rectangle. The rectangle is x in width and y in length. If the area of semicircle is 1/3 of the area of rectangle. What is the ratio of the arc of the semicircle to x?
191020	Two straight lines intersect at (1, -1), and given that the product of the slopes of two lines is -1. One of the lines intersects the x axis at (3,0). What is the intercept of the other line with the Y-axis?