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来源	题目内容
190321	Is there a solution to the equation ax^2+bx+c=0? 1:a>b 2:b>1/2
190321	The product of all integers from 1 to n, inclusive, is a multiple of $$10^6$$. What is the minimum value of n?
190321	The diameters of the three concentric circles are 4,8,10, respectively. What is the proportion of the shaded area in the figure to the total area?
190321	Regular hexagon ABCDEF is inscribed on circle O whose radius is 5. What is the area of the shaded area?
190321	There are four numbers in a set S. The median and the average are both 6. What is the range of these numbers? 1: The smallest number is 3. 2: The largest number is 6 larger than the smallest one.
190321	$$\frac{5!+6!+7!}{6!+7!+8!}$$ = ?
190321	The quadrilateral ABCD is a trapezoid. AD//BC, ADC=BCD=90°. AD=9, BC=5, CD=12. AB+BD+AC=?
190321	The circumference of a circle is $$36 \pi$$. What`s the radius of the circle?
190321	There are 12 candies with four colors in an opaque bag. The proportion of red candy, yellow candy, white candy and green candy is 1/3,1/2,1/12,1/12, respectively. If two candies are taken out, what's the probability of picking at least one white candy out of this bag?
190321	105m/s=?km/h
190321	Is x odd? 1: x is an integer. 2: (x+1)(x-1) is even.
190321	What`s the remainder of $$10^{98}-1$$ when divided by 11?
190321	The equation of the circle $$O_1$$ is $$x^2+y^2=4$$. The equation for $$O_2$$ is $$(x-a)^2+(y-b)^2 = 4$$. a and b are constants.$$a^2+b^2 = 4$$ . The two circles intersect on line l What is the equation of the line?
190321	$$a_n=a_{n-1}+3(n \geq 1)$$.$$a_1=2$$. What`s the remainder of $$a_{98}$$ when divided by 10?
190321	$$\frac{1}{16^x+16^{-x}}$$=?
190321 还原机经选题	n is a three-digit number. Is n odd? 1: The sum of the three digits of n is odd. 2: The sum of the hundreds and the unit digit of n is twice of the tens digit.
190321	A student wants to choose two arbitrary letters from the 26 letters of a-z. How many ways for him to achieve his goal?
190321	$$a_1 < a_2 < a_3$$,$$a_1$$,$$a_2$$,$$a_3$$ are integers. Is the average of these three numbers larger than the median of them? 1:$$\frac{a_1+a_3}{2} - a_2 = 3$$ 2:$$a_3 - \frac{a_1+a_2+a_3}{3} = 250$$ , $$a_1 - \frac{a_1+a_2+a_3}{3} = -150$$
190321	The surface area of cube A is K times of that of cube B. What is ratio of the volume of cube A to that of cube B?
190321	m and n are both 3-digit numbers. Is m>n? 1:The unit digit of m is less than n. 2:The sum of m`s hundreds digit and tens digit is greater than that of n.