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190302	As shown in the figure, the two circles are concentric. AB is tangent to the small circle. The triangle ABC is an equilateral triangle. What's the difference of the area between the big circle and the small circle? 1: The circumference of the triangle ABC is 24. 2: The area of the triangle ABC is $$16\sqrt{3}$$ .
190302	n=$$2^{5}$$$$3^{4}$$$$5^{3}$$$$7^{2}$$11 .How many positive factors does n have?
190302	$$x^{2}$$+ax+20=0.a=? 1: The product of the two solutions of the equation is 20. 2: -5 is a solution to the equation.
190302	80 < x < 120. The remainder of x divided by 8 is 4. What is the value of x? 1: x can be divided by 9. 2: x can be divided by 12.
190302	BC is perpendicular to AB. AC=2600, $$\frac{BC}{AB}$$=$$\frac{5}{12}$$, BC=？
190302	There are three machines in the factory. The machines A, B and, C need 90min, 30min and 15min respectively to produce 80000 sheets of paper. If 3 machines work together, how many minutes does it take to produce 80000 sheets of paper?
190302	The length, width and height of cuboids are x, y, and z, respectively. If the length, width and height of a cuboid are changed to 3x, 5y, and 4z, respectively. How many times the volume of larger cuboid as that of the original cuboid?
190302	In the 12 months of 1999, the range of sales was 240. In the 12 months of 2000, the range of sales was 320. What is the minimum range of sales in the 24 months of 1999 and 2000?
190302	$$x^{2}$$-(m-2)x-$$(n+4)^{2}$$=0 has only one solution. mn=?
190302	There are 365 days in a year. If the $$294^{th}$$ day is Friday, what is the last day of the year?
190302 还原机经选题	A,B are two-digit integers. The tens of A is three. The unit digit of B is 5. A(B+1)=2016. 5A+2B=?
190302	uv > 0, Is $$u^{2}$$*$$v^{3}$$ > 0 1:u > 0 2:v > 0
190302	The general term of {$$a_n$$} is $$a_{n+2}$$=$$a_n$$+11. Does 633 belong to the sequence {$$a_n$$}? 1:$$a_1$$=50 2:$$a_2$$=49
190302	In the coordinate system, the slope of OA is $$\frac{7}{24}$$. BA=14. OA=?
190302	$$a_1$$=10,$$a_{n+2}$$=$$a_{n+1}$$+$$a_n$$.$$a_4$$-$$a_3$$=? 1:$$a_5$$-$$a_4$$=21 2:$$a_2$$=11
190302	The sum of x, y, and z is even. Can xyz be divided by 4? 1: x=y=z 2: x,y,z are even.
190302	The length, width and height of cuboid are w, m and h respectively. The cuboid is filled with a little water. When wm is the bottom, the height of water is x (x < h). When mh is the bottom, the height of water is y (y < w). $$\frac{x}{y}$$=? 1:x=3 2:$$\frac{w}{h}$$=7
190302 还原机经选题	n=1234567891011121314-. n is an integer composed of positive integers arranged in order. From left to right, what is the 72nd digit of n?
190302	What is the unit digit of n? 1: The tens digit of $$11^{n}$$ is 4. 2: The tens digit of $$5^{n}$$ is 2.
190302	p < q < r < s < t. The average of these five numbers is 6 less than t and 5 more than p. What is the range of {p,q,r,s,t}?