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190207
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The number of girls in a class are 1.5 times as many as that of boys. The number of girls learning French is the same as that of boys. The number of students learning French in the whole class accounts for one tenth of the total number. What is the proportion of boys who do not learn French in the class?
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190207
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Square ABCD is divided equally into 100 small squares on average. How many small squares does diagonal AC intersect at least one point?
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190207
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$$a_1$$=56,$$a_2$$=57,$$a_3$$=59 .$$a_n$$=5n+$$a_{n-3} $$ (n≥4) Which of the following numbers belong to the sequence {$$a_n$$}?
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190207
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A person bought two sweaters and a belt at a discount. What is the average discount?
1: The sweater was 10% off.
2: The belt was 20% off.
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190207
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x,y are positive integers. The reminder is 3 when x is divided by y . Is 6 a factor of x?
1: 2y is a multiple of 3.
2: x
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190207
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The average of six integers, U,V,W,X,Y,Z is 42. Is the median of these six numbers less than 42?
1: All of the numbers are no less than 41.
2: Y=47.
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190207
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$$n^{3}$$ is a four-digit number whose unit digit is 3. What is the unit digit of the sum of the four digits of $$n^{3}$$ ?
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190207
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n is a positive integer. The reminder of n divided by 5 is equal to that of divided by 5 ,what is the value of n.
1: The reminder is 1.
2: n can divided by 6.
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190207
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$$2^{16}$$*$$5^{10}$$=?
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190207
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x+3y+5z=0, x+2y+3z=6. x+y+z=?
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190207
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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,$$F_2$$=?
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190603
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As shown in the figure, the rectangle inside is a grassland, the outside is a runway, there are four quarter arcs, and the radius is d, what is the area of the runway?
(1)The area of the grassland is 15d
(2)The area of the grassland is 150
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190603
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Two machines X and Y, each working at constant efficiency. Machine X: produce 5000 parts in 6 hours, Machine Y: produce 5000 parts in 2 hours. If X and Y work together to produce a batch of products, what is the proportion of production of X?
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190207
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The median of the set {131,146,156,a,b} is 151. What is the minimum average of these numbers?
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190302
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x,y are positive integers. Does x consist of the sum of the squares of two positive integers?
1: x is prime.
2: x=4y+1（0 < y <5）
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190302
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There is a set of {1,2,3,4,5,6}. What is the probability that two non-repeated numbers are randomly selected from the set and the sum of the two numbers can be divided by 4?
1: One of the two numbers chosen is three times the other.
2: Both numbers selected are odd.
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190302
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r,s,t are three real numbers. Will the average and median of the three numbers be equal?
1: The average of the three numbers is s.
2: r < s < t
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190302
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The area of a circle is $$\frac{9π^{2}}{4}$$. What is the diameter of the circle?
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190302
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The angle of the sector shadow area is 75 ° and the corresponding area is 7.5 π. What is the area of the whole circle?
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190407
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a,b,c,d are integers. 1 ≤ a,b,c,d ≤ 9.(a+d)(b+c)=?
1：abcd+dcba=7557.
2：abcd+dca=1832
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