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190310
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$$(\sqrt{5} - \sqrt{3})^2$$ = ?
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190310
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A positive integer x is a multiple of 5. What is the remainder of x when divided by 6?
1: The remainder of x is 3 when divided by 12.
2: The remainder of x is 3 when divided by 4.
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190310
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What is the largest prime factor of 2205?
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190310
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r,s are positive numbers. Is r < s?
1:r+s<1
2:$$r^2=2s$$
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190310
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$$\frac{4- \sqrt{28}}{\sqrt{9+7}}$$ = ?
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190310
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学校向优秀学生发放奖学金。一等奖得主每人奖励$125。二等奖得主每人奖励$40。三等奖得主每人奖励$15。学校共发了$1780。请问至少有多少人能拿到奖学金？
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190310
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An empty pool will be poured with water at the speed of 50L/min. The volume of the pool is 120m^3. How long will it take to fill the pool?
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190310
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The cost of each table is $50. The cost of each chair is $5. The profit of the table is 30% of the cost. The profit of the chair is 50% of the cost. A furniture store sold five times as many chairs as tables. The total profit on tables and chairs was $550. What's the total price of the tables and chairs sold?
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190310
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∠ABM=45°, EF//MN. Quadrilateral ABCD is rectangular. AB=?
1:AE=8
2:BF=25
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190310
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a,b,c are non-zero one-digit number. abc is a three-digit integer with hundreds digit as a, tens digit as b, and unit digit as c. bac is a three-digit integer with hundreds digit as b, tens digit as a, and unit digit as c. abc+bac= 998. How many possibilities are there for the value of a,b,c?
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190310
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$$(x^2+2x+1)(x^2-2x+1)=x^4+1$$.x=?
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190310
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The bottom surface of the inverted conical vessel is parallel to the horizontal plane. The height of the cone is twice of the radius of the bottom. The container is partially filled with water. There is a small hole at the tip of the conical container. The speed of water leakage is 2cm^3/min. How long does it take for the water in the container to run out?
1: The water surface area is 9 π cm2
2: The distance between the water surface and the bottom of the container is 4 cm
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190310
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A shop sold 10 sets of TV in a week. What is the median of the daily sales?
1: At least 1 TV set was sold every day.
2: At most two TVs were sold every day.
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190310
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Eight apples and three peaches cost twice as much as three apples and four peaches. What is the ratio of the price of a peach to that of an apple?
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190310
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Which of the following options satisfy $$x^{-9}-x^{-8} >0$$?
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190310
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What is the unit digit number of ?
1: k can be divided by 10.
2: k can be divided by 4.
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190310
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Five numbers are chosen randomly from 1 to 20 (boundaries are included). What's the probability that the five numbers include both 10 and 20?
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190310
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$$ax^2+bx+c=0$$ Does the equation have at least one solution?
1:a > 0
2:c < 0
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190113
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x=a$$\sqrt{b}$$, y=c$$\sqrt{d}$$. If a, b, c and d are positive integers, and x and y are not integers. Is xy an integer?
(1) $$\sqrt{ad}$$ is an integer.
(2) $$\sqrt{bc}$$ is an integer.
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190113
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The radius of a circle is 10. The area of the sector(fan-shaped) whose center angle is x is A. Which of the following formulas can express A in terms of x?
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