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181215
|
Someone's home and company are on the same side of a straight road. However, because of the construction of the road, he has to take a detour. Now he goes to the company by walking 3km to the north, 6km to the west and 5km to the north from his home. How many kilometers does this person walk more than usual?
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|
181215
|
$$0.1^{n+1}$$ ≤ 0.00625 ≤ $$0.1^{n}$$.n=?
|
|
181215
|
$$(x+y)^{2}$$=13,$$(x-y)^{2}$$=5, xy=?
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190124
|
A six-digit number is composed of 54X, Y, and 18. X and Y could be 3,5,8 and X and Y can be equal. How many cases are there in which 8 is a factor of this six-digit number?
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|
190113
|
$$(9+\frac{1}{9})^{2}$$-$$(9-\frac{1}{9})^{2}$$=?
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190124
|
x comes from the set {-3,-2,-1,2,3}. How many different results can be achieved by substitute the possible value of x into the algebraic expression -|$$x^{2}$$-1|?
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190124
|
$$a_1$$,$$a_2$$,$$a_3$$,$$a_4$$, $$a_5$$,$$a_6$$ are six integers, which are not equal to each other. f(x)=-$$x^{2}$$. What is the least number of results that can be achieved by substituting $$a_1$$,$$a_2$$,$$a_3$$,$$a_4$$, $$a_5$$,$$a_6$$ into f(x)?
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190321
|
There are 20 balls in an opaque box. The color of the ball may be red, green, white, or yellow. There are five green balls in the box. The probability of picking a green ball or a yellow ball from the box is no more than 3/5. How many yellow balls are there at most?
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190415
|
What's the hundreds digit of 12.3789*9999?
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|
190321
|
$$\frac{20! 10!}{2! 5! 5!}$$can be divided by $$10^n$$. What's the largest value of n?
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|
190415
|
In the sequence {$$a_n$$}, $$a_1$$=3,$$a_2$$=5,$$a_n$$=$$a_{n-1}$$+$$a_{n-2}$$(n≥3).$$\frac{a_24}{a_20}$$=?
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190215
|
The line $$l_1$$ goes through (5,p) and (1,3). The equation of line $$l_2$$ is x-2y-6=0 . What is the value of p when $$l_1$$ parallels to $$l_2$$ ?
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190215
|
$$\frac{10n}{7}$$=k+$$\frac{q}{7}$$,n,q are positive integers smaller than 7. What is the maximum value of k?
|
|
191020
|
x is 30% more than y, and y is 40% less than z, What was the percent decrease from z to x?
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190215
|
The distribution of students' scores is shown in the table. What is the median score of these students?
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|
191031
|
ABCE and AFCD are two rectangles, E is on FD, AB = 1, BC = 2, What is the area of rectangular AFDC.
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190215
|
$$\frac{1}{10^{n+1}}$$ < 0.00068 < $$\frac{1}{10^{n}}$$ .n=?
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|
190207
|
One machine can complete 800 units of work in 2.5 hours. How many machines can complete 7200 units of work in 8 hours?
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|
190603
|
|x|+|y|≤1，x²+y²=1，How many points satisfy these two conditions at the same time?
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190207
|
What is the reminder of $$2^{2550}$$ when divided by 7?
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