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190215	The reminder is 1 when n is divided by 4 and the reminder is 2 when n is divided by 3. Which of the following range might n fall into?
190215	n small balls with radius r were put into a cylinder filled with water, and the small balls were completely submerged in the water. The radius of the bottom circle of the cylinder is 4r, and the height of water before and after putting the balls is $$h_1$$ and $$h_2$$. How to express the difference of $$h_2$$ and $$h_1$$ with n and r?
190215	10 ≤ n ≤ 99 . n is an integer which can be divided by both 3 and 7. What is the number of the possible value of n?
190215	The range of 9 consecutive positive integers is r. The standard deviation is d, and the average value is m. Which of the following options correctly determines the relationship among r, d, and m?
190215	The formula of a straight line in the plane rectangular coordinate system is y = 2x-2. The center of circle O is on this line. The circle and line intersect at P and Q. What is the area of the circle? 1: Center coordinates (5, 8) 2: The difference between the abscissa of P and Q is 2
190215	x > 0.y,z < 0.$$(\|x\|+\|y\|+\|z\|)^{2}$$=?
190215	The vertex coordinates of quadrilateral ABCD are A (3,1), B (10,1), C (5,8), D (3,5). How many right angles are there in this quadrilateral?
190215	Machine A needs 5 hours to complete a task. When machines A and B work together, the same task can be completed in 1.875 hours. How long does it take for B to finish the task alone?
190215	Two circles of the same size intersect to form three regions, as shown in Figure 1. How many areas will be formed at most when two squares of the same size intersect?
190215	In rectangular coordinate system, ABC is a right triangle. AC is perpendicular to BC. What is the abscissa of C? 1：A(10,5) 2：B(0.5,2)
190215	The list price is 20% higher than the wholesale price. The retail price is 15% lower than the list price. How many times the wholesale price is the retail price?
190215	1：B∩A=C 2：D∪A=X
190215	The standard deviation of the five numbers s,t,u,v,w is d. Which of the following series has the same deviation?
190215	In the right triangle ABC, ∠ABC=30°. AC is perpendicular to BC. AC=28. BC=?
190215	Is n=u? 1:$$n^{2}$$+$$u^{2}$$=0 2:$$n^{2}$$-$$u^{2}$$=0
190215	x+y is a multiple of 35. x=? 1: The reminder is 1 when x is divided by 5. 2: The reminder is 2 when x is divided by 7.
190215	The teacher plans to put A,B,C,D and E in five seats in the same row. D and E cannot be adjacent. How many arrangements are there?
190215	What is the value of n when the average of the five numbers 1, 3, 4, n, 10 is equal to the median?
190215	The square is inlaid with an octagon. The circumference of the octagon is 16. What's the circumference of the square?
190215	x+$$\frac{1}{x}$$=5.$$\frac{1}{x^{2}}$$+$$x^{2}$$=?