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190603
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450 people are divided into several groups, and the number of people in each group is the same. If three groups are added, the number of people in each group will be reduced by five. How many groups were originally divided?
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190207
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Is 3 a factor of n?
1: 2n can be divided by 6.
2: 3n can be divided by 6.
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190207
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What is the value of mn, if m,n are natural numbers.
1：$$2^{n}$$=$$3^{m}$$
2：$$m^{2}$$+$$n^{2}$$=5
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190207
|
There are twenty-six cards, in which six cards with the letter C, and the rest with the letter O. Two cards were chosen randomly from these 26 cards. What's the probability that one letter is C and the other is O?
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190207
|
a,b,c are integers.1 < a ≤ b ≤ c , $$\sqrt{abc}$$ ≤ 27. a=?,b=?c=?
1：a ≠ b
2：c=27
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190207
|
f(x)=p$$x^{2}$$+2qx+2. Does the function intersect the x axis at two different points?
1：$$p^{2}$$ > q
2：$$q^{2}$$ > p
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190207
|
$$\frac{2^{16}*5^{6}}{8^{3}}$$=?
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190207
|
The selling price of the goods remains unchanged, but the reduction in cost leads to an increase in profit from 10% to 20% of the selling price. After cost reduction, it will be $200. What is the initial cost?
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190207
|
x < $$\sqrt{\frac{1.22}{1.68}}$$?
1:x < $$\frac{11}{13}$$
2:x < $$\frac{ \sqrt{3}}{2}$$
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190207
|
Two machines of the same model work together and can complete a certain task in k hours. If three machines of this model work together, k -2 hours can complete the same task. k =?
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190207
|
It si given that: d=$$2^{64}$$ , $$d^{d}$$=$$2^{k}$$. So what is the value of k
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190207
|
∠A=90°, AB=AC. Circle O inscribed on triangle ABC. The radius of the circle is . AO=？
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190207
|
It is given that: 0 < x < z < y < 1. When x replaces y, which option has a smaller value?
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190207
|
The distance between the bottom of the two wires is 60m. What is the top distance between the two wires?
1: The difference between the height of two lines is 25m.
2: The sum of the height of the two lines is 70m.
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190113
|
Four real numbers meet the conditions that w < x < y < z and wxyz < 0. Which one of the following options must be true?
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190113
|
The ages of the three children are consecutive even numbers. How old is the oldest child?
(1) After 18 years, the sum of three children will be 2.5 times of that of the present age
(2) The youngest child after 5 years will be 7 years old.
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190113
|
A clock recorded the end of a meeting that is 10:08 in the morning. How long did the meeting last?
(1) The meeting started at 8:00 in the morning that morning.
(2) The hour hand went 64 degrees in total during the meeting.
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190113
|
A, B and C are positive integers. If A+B+C is even, is A+B+C a multiple of 4?
(1) A=B=C
(2) A,B,C are even.
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190113
|
The first annual interest rate was 9%. In the second year, the investor used the principal and interest of the first year as the principal for investment. The annual interest rate of the second year was 10%. At the end of the second year, the sum of the initial principle and the interest of these two years was $20000. How much was the initial principal?
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190113
|
Is |xy|+xy ≤ 0？
(1)|x|+xy ≤ 0
(2)|y|+xy ≤ 0
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