One elementary school math problem, 10 marks.

I'm a sixth-grade girl. I'm ready to go up to high school too. I think I should be able to solve this problem.

Multiples of 2 should be 60% likely.

And the multiple of 3 should be 100%...

The probability of multiples of 5 should be 20% of the likelihood.

Actually, my idea is that the single digit of a multiple of 2 is 0, 2, 4, 6, 8....Then you have 5 numbers here. And multiples of 2 account for three. Then 3 divided by 5....That's 60%...

A multiple of 3 is a multiple of 3 when the numbers on each bit are added together. Then he is a multiple of 3. Then all the numbers here add up to multiples of 3. It proves that no matter how you swing, it is a multiple of 3. Then a multiple of 3 is probably 100%...

Multiples of 5 should be 0 5....Then there's only 5....Let's just say that the probability of a multiple of 5 is 20%...

Let me explain. I came up with all these answers. I didn't copy it on the Internet.

Respect my wisdom. As for the answer, you don't take it. Then I don't care.

But I still want you. You can think of a solution for yourself later. Asking people everywhere is not good for you.

Is this an elementary school topic?

is a multiple of 2 3*4*3*2*1=72

is a multiple of 3 5*4*3*2*1=120

is a multiple of 5 1*4*3*2*1=24

The probability of being a multiple of 2 is 60%.

The probability of being a multiple of 3 is 20%.

The probability of being a multiple of 5 is 20%.

Earned cost: 20a+30b

Revenue (20+30) (a+b) 2=25a+25bProfit: (25a+25b-(20a+30b)=5a-5b

5（a-b）

Because a b, profit = 5 (a-b) > 0

Purchase price: 20a+30b

The money earned from selling: (20+30)(a+b) 2=25a+25b, because a b, so 25a+25b>20a+30b, so he earned.

There were 43 people and 2 people were absent.

You see, 7*6=42+1=43

Fit the topic. Got it.

+1 is the total number of people.

2*3*7+1=43 (person).

Absence: 45-43=2 (person).

1. The school bought back 37 boxes of white chalk, and the colored chalk bought back was 29 boxes less than the white chalk, how many boxes of colored chalk were bought?

2. There are 35 lychee trees and 26 longan trees in the orchard.

1) How many trees are there in total?

2) How many fewer longan trees are there than lychee trees?

3. Xiaoying made 42 safflowers, 34 yellow flowers, and 15 white flowers.

1) How many more safflowers are there than yellow flowers?

2) How many fewer white flowers than red flowers?

3) How many fewer white flowers than yellow flowers?

4) How many flowers are there?

4. Pick a suitable question and draw it""and then figure it out.

1) The store sells 50 dolls twice and 30 ,...... the first time

How many were sold for the first time?

How many were sold the second time?

How many are sold twice?

2) There are 60 chicks and 28 hens.

How many are left?

How many fewer hens are there than chicks?

How many are there?

5. Choose a suitable condition and draw it""and then figure it out.

1) There are 18 pots of chrysanthemum ,...... on campusHow many pots of orchids are there compared to chrysanthemums?

16 pots were transported;

5 pots left; 16 pots of orchids.

2) Buy 50 apples ,...... kindergartenHow many pears do you buy?

12 to the children;

12 fewer pears than apples;

There are 12 more pears than apples.

6. Connect the appropriate conditions and questions first, and then answer them.

1) There are 30 white rabbits and gray rabbits, and 24 white rabbits.

How many were there?

How many grey rabbits are there?

2) There were some rabbits, 4 of them ran away, and 18 of them.

How many are left?

7, Lan Lan and Xiao Fang originally had the same number of exercise books, if Lan Lan gave Xiao Fang 4, Xiao Fang would have more exercise books than Lan Lan?

8. Xiao Ming is now 98 cm tall, 7 cm taller than last year, how tall was Xiao Ming last year?

9. There is a white cloth and a flower cloth, if the white cloth is cut off 6 meters, and the flower cloth is cut off 4 meters, the two pieces of cloth are the same length Which cloth is long? How many meters is it long?

10. There are two layers of bookshelves, the first floor has 16 books, the second floor has 8 more books than the first floor, and how many books are there on the second floor?

A total of 37 ** cards are needed, in addition to the 6 cards given by the yuan, it is also needed: 37-6 = 31 cards.

Total cost: 31 RMB.

Average per student: 62 37 RMB.

The sum of two numbers greater than or equal to 0 = 0

then they are 0, so a= b=-3

2ab/3=-1

The sum of the two terms is 0, i.e.

The root number (2a, 1) 0 is a=1 2 b+3 squared 0, so b=-3

The final result is 1

According to the characteristics of the square and the characteristics of the root number, it is judged that 2a-1 is a negative number, or a zero. Observations show that there are two sets of solutions:

Solution 1: b is -2 and a is 0, then 2ab is zero, and the fifth root of 2/3ab is also 0

Solution 2: A is one-half, B is -3, then two-thirds of ab is -1, and the fifth power is -1

So there are two sets of results, 0 or -1