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200301
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The ratio of zinc and copper in X is 5: 7, and the ratio of zinc and copper in Y is 8: 7. After mixing the same amount of X and Y, what is the ratio of zinc and copper in the new mixture？
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200301
|
ABCD is a square. According to the picture below, what is the area of EMHN?
(1) Perimeter of ABCD is 48
(2) Area of ABCD is 144
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200301
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The sequence $$a_1$$,$$a_2$$......$$a_n$$, such that $$a_1=3$$,$$a_2 = 5$$,$$a_3 = a_1 +a_2$$,$$a_4 = a_1+a_2+a_3$$,$$a_n=a_1+a_2+$$...+$$a_{n-1}$$. What is the ratio of $$a_{24}$$ to $$a_{20}$$?
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200301
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As shown in the figure, ABCD is a square, and ABE is an equilateral triangle. What is the measurement degree of x?
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200301
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Is positive integer x a sum of squares of three different positive integers?
(1)x < 29
(2)x is divisible by 7
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200301
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Arrange six letters h,t,l,a,o,s in a row, among which the letters in the first, second and fourth positions can only be selected from the three letters--h,t,l. How many arrangements are there?
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200301
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Is n a multiple of 25?
(1)n is a multiple of 5
(2)n is the square of an integer
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191031
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If k=0.0004, which of the following has the greatest value?
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191031
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It takes 10 hours for machine A and machine B to finish a certain job together. The working speed of A is 5 times faster than B. So how many hours does it take for A alone to do the same job?
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191031
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There are 5 numbers, is the range > 40?
(1)Median=70
(2)Mean=50
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191031
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An obtuse triangle has three sides, and the length of each side is 40, 9 and x. Which of the following could be the possible value of x?
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191031
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The sum of x and y is a prime number, is the sum of x and y odd?
(1)x is odd
(2)y>2
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191222
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If a and b are positive integers, which are less than 10, what is the range of a/b?
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191222
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What's the value of [(3*√32 - 4*√2) /√8 ]^2？
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191222
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A car has to go from one place to another, the average speed in city road is 15 miles/hour, and the average speed in highway is 60 miles/hour. Then it goes 5 miles in city road and goes 50 miles in highway, what is the total average speed? (results are round to the nearest integer)
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191222
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As shown in the figure, what is the expression for the trapezoid area？
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191222
|
Given that positive integer p is not a square number，is p prime ?
(1)Only p itself is the factor of p that is greater than $$\sqrt{p}$$
(2)Only 1 is the factor of p that is smaller than $$\sqrt{p}$$
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191222
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The height of tower A is 50 meters, of tower B is 200 meters, and the distance between these two towers is 300 meters. The government plans to build a wall between A and B , and the wall should not exceed the straight line of the tops of tower A and B. What is the greatest height of the wall if it is 100 meters away from the tower A ?
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191222
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If two dice are flipped at the same time, what is the probability that “6” shows up at least once ?
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191222
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|2-|2-x||=2，How many solutions do X have?
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