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190207	In order to maintain the balance of the lever, the force and distance shall conform to the following relationship,$$F_1l_1$$=$$F_2l_2$$ .$$l_1$$=2m,$$l_2$$=3m . $$F_1$$=12N,$$F_2$$=?
190207	x,y are positive numbers. x$$y^{\frac{1}{2}}$$=? 1:$$x^{2}$$y=13 2:x$$y^{2}$$=14
190207	There are nine points on a circumference. How many different hexagons can be formed by selecting 6 of these 9 points?
190207	What is the reminder of $$2^{2550}$$ when divided by 7?
190207	Is 3 a factor of n? 1: 2n can be divided by 6. 2: 3n can be divided by 6.
190207	The median of the set {131,146,156,a,b} is 151. What is the minimum average of these numbers?
190207	What is the value of mn, if m,n are natural numbers. 1:$$2^{n}$$=$$3^{m}$$ 2:$$m^{2}$$+$$n^{2}$$=5
190207	h(x)=x-$$x^{2}$$. Is h(a) > h(b)? 1:a < b 2:$$a^{2}$$ > $$b^{2}$$
190207	There are twenty-six cards, in which six cards with the letter C, and the rest with the letter O. Two cards were chosen randomly from these 26 cards. What's the probability that one letter is C and the other is O?
190207	a,b,c are integers.1 < a ≤ b ≤ c , $$\sqrt{abc}$$ ≤ 27. a=?,b=?c=? 1:a ≠ b 2:c=27
190207	$$\frac{\sqrt{3}+\sqrt{2}}{\sqrt{3}-\sqrt{2}}$$=?
190207	1+x+$$x^{2}$$+$$x^{3}$$+$$x^{4}$$ < $$\frac{1}{1-x}$$? x≠1 1:x < 1 2:x > 0
190207	f(x)=p$$x^{2}$$+2qx+2. Does the function intersect the x axis at two different points? 1:$$p^{2}$$ > q 2:$$q^{2}$$ > p
190207	$$\frac{2^{16}*5^{6}}{8^{3}}$$=?
190207	x+y=120, x+z=100. What is the value of x ? 1:x+y+z=160 2:y+z=100
190207	It took 8 hours for a machine to finish 4/11 of the work. How many more 8 hours will it take to finish the rest of the work?
190207	a=x+$$\frac{1}{x}$$,b=x-$$\frac{1}{x}$$,$$\frac{(2^{a})^{2}}{(2^{b})^{2}}$$=?
190207	Machine A takes 24 hours to empty one cylinder of water. Machine A drains the water for 8 hours and then change to machine B. B's speed is 2 / 3 of that of A's. How long does it take B to drain the remaining water?
190207	The line $$l_1$$ goes through (3,-2). The line $$l_2$$ goes through (0,3) and (3,5). $$l_1$$ is perpendicular to $$l_2$$. What is the algebraic expression of the line $$l_1$$?
190207	One item's listed price is 10% less than its regular price. It was sold with another 50% discount, by what percent discount of the regular price the item was sold?