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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
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$$\frac{20! 10!}{2! 5! 5!}$$can be divided by $$10^n$$. What`s the largest value of n?
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190124
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x+2y+3z=7, x+3y+5z=12. x+y+z=?
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190321
|
In a rectangular plane coordinate system, the equation of circle O is $$x^2+y^2=10$$. How many points are there on circle O whose abscissa and ordinate are integers?
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190321
|
$$k^4$$can be divided by 32. What is the reminder of k when divided by 32?
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190415
|
How many more diagonals are there in an octagon than in a heptagon?
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190415
|
What`s the hundreds digit of 12.3789*9999?
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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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190321
|
p=10k+1. k is a positive integer. What`s the unit digit of $$(p^2)^100$$?
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190310
|
The product of three positive numbers,$$2^4$$,x,$$5^3$$ , is a multiple of $$10^4$$. What is the minimum value of x?
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|
190113
|
$$(\frac{3\sqrt{32}-4\sqrt{2}}{\sqrt{8}})^{2}$$=?
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190310
|
$$(x^2+bx-1)(x^2-bx+1)=x^4-9x^2+6x-1$$.b>0,b=?
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190310
|
x+2y+3z=5,2x+3y+4z=17,x+y+z=?
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190310
|
$$\frac{1}{(2n-1)!} - \frac{1}{(2n+1)!} = \frac{an^2+bn+c}{(2n+1)!}$$.a+b+c=?
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190603
|
Given that x is a positive number and 2/(x+2)+3/(x+3)>1, what is the possible value of x2?
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190207
|
How many zeros are there at the end of (3! + 4!)!
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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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190207
|
x+3y+5z=0, x+2y+3z=6. x+y+z=?
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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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190215
|
10 ≤ n ≤ 99 . n is an integer which can be divided by both 3 and 7. What is the number of the possible value of n?
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