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I just can't list the formula of the equation of one variable
The process of solving the equation of application problem: let x (set what the problem is) set up the equation to solve the equation (Note: before the solution, there is a "solution" at the beginning, so there is no need to write "solution". Finally, x =? Let me give you an example: 6 cans, 9 drink bottles, each price is the same, a total of 1.5 yuan, how much is each? There are not 6 cans, 9
50 calculation problems in Grade 6 of primary school
It must be simple!
Blue sky wood processing factory has 56 workers, each worker can process 10 desks or 15 square stools every day on average. In order to supply the market, one desk and two square stools must be matched into a set of delivery. How to arrange the number of desks and square stools processing, so as not to cause waste, but also to maximize the supply?
If there are x people processing desks, the remaining (56-x) people are the production benches. According to the meaning of the question, we can get the equation: 2 × 10x = 15 (56-x), and the solution is x = 24, 56-24 = 32 (people). Answer: if we arrange 24 people to process desks and 32 people to process benches, we can make the processing desks and benches just match the delivery, so as not to cause waste and meet the supply
Practical questions,
1. The supermarket brought 360 cases of juice and sold 3 / 8 of them in the first week and the remaining 1 / 3 in the second week. How much did they sell in two weeks?
2. A bicycle factory produced 4000 bicycles in the first quarter, of which 1600 were produced in January. The ratio of February to march was 2:3. How many bicycles were produced in March?
1.360 * 3 / 8 = 135 cases
360 * [(1-3 / 8) * 1 / 3] = 75 cases
135 + 75 = 210 cases
2.4000-1600 = 2400 vehicles
2+3=5
3 / 5 * 2400 = 1440 vehicles
Take two of the nine cards with numbers 1-9, and try to find the probability that the product of two numbers is a complete square number?
1,4,9 probability: (1 / 9) * (1 / 8) * 2
2 8 ：(1/9) * (1/8)
4 9 ：(1/9) * (1/8)
The total probability is (1 / 72) * 4 * 2 = 1 / 9
Take any two of the nine cards with the number 123456789, and the product is the probability of a complete square
8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 36 species
Complete squares: 1,4,9 (3)
3/36=1/12
What is the probability that the sum of the two numbers in any two cards is a complete square number?
It's better to be more specific ~ homework is very difficult to say (for me) Everybody help~
9 × 8 / 2 = 36 species
The maximum is 9 + 8 = 17 and the minimum is 1 + 2 = 3
Then the complete square number is 4,9,16
And 4 = 1 + 3,9 = 1 + 8 = 2 + 7 = 3 + 6 = 4 + 5,16 = 7 + 9
The probability is 6 / 36 = 16.67%
Take any two of the nine cards with numbers 1-9 and observe the numbers above. Then why is the probability that the product of the two numbers is a complete square number 1 / 9?
There are 36 different ways to choose C (9,2) = from 9 cards with numbers 1-9
There are four ways to take the product of two numbers as a complete square number: (1,4), (1,9), (2,8), (4,9)
So the probability that the product of two numbers is a complete square number is 4 / 36 = 1 / 9
The sum of 10 natural numbers is equal to 1001. This is the greatest common factor of a natural number. What is the maximum value that can be obtained? Hint: the answer is 13, please explain in detail
The answer is not right. It should be at least 91
For example, these 10 numbers are: 9 91, 1 182
If 91x9 + 182 = 1001 is satisfied, the greatest common factor is already 91
91 > 13 the maximum value of the greatest common factor of the given answer is 13, which is definitely wrong, or the question has other restrictions
Among the numbers from 0 to 10, the number that is even and prime is zero______ A number that is both odd and composite is______ A number that is even but not natural is______ ．
According to the definitions of even number, odd number, composite number, prime number and natural number, among the numbers from 0 to 10, the number that is both even and prime number is 2, the number that is both odd and composite number is 9, but 0-10 are all natural numbers
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