Funny number questions, funny number questions

1.Write the number 6 to the left of a four-digit number, and then add 8000 to the resulting five-digit number, and the result is exactly 35 times the original four-digit number. What was the original four-digit number?

Let the original four digits be x, then the obtained five digits are: 60000 + x60000 + x) + 8000 = 35x

x=2000

That is, the original four-digit number is: 2000

2.Two students want to buy the same book, A is missing 1 yuan for the book, and B is short of 1 yuan. When they buy it together and are short of dollars, what is the unit price of the book?

If the unit price is x, then A has money x-1 and B has money.

x-1）+（8=x

x=5 means that the unit price of this book is 5 yuan.

1.Let this four-digit number be x, then.

60000+x）+8000=35x

x=2000

2.Let this book be $ x, then.

x-1)+(

x=5 yuan.

This morning, my mother checked the 53 workbook I did a few days ago, and the first unit of the homework was improved.

I was found to have four wrong questions, one of which I couldn't correct. I told my mom about it. So, my mother and I discussed this question together.

He told me that in this fill-in-the-blank question, if you want to write an estimation method, you have to write a numerical column directly. I was puzzled and asked, "If I don't write the text, the answer won't be the same thing?"

Your method is right, but the calculation is wrong. "What's wrong? "I'm even more confused:

Isn't this question just adding up the prices of the things you buy and comparing them?

At this time, my mother said: "Li Gao talks about bringing Zeyu, you take a closer look at the ** standards given by the three commodities on the picture." "After listening to my mother's words, I once again carefully looked at the ** of the goods, they are normal and can no longer be normal, right?

Drinks A bottle is indeed a bottle. And a box of paper, four boxes can be drawn on the picture! "I was so shocked that my jaw dropped to the ground!

Can the question still come out like this? I thought the bags and bottles he said were all drawn on the picture! Hey

I finished this question stupidly, thinking to myself: the current questions are so funny, the author of the question is so bad - at the same time, this question also made me realize a truth, no matter what you do, you must be serious, do it carefully, and look carefully.

Solution: 400 Let the original 3-digit judgment hole number be 100a+10b+c, which is known by the title:

21 (100a+10b+c)=8000+100a+10b+c2100a+210b+21c=8000+100a+10b+c2a*1000+(a+2b)100+(b+2c)10+c=8000+100a+10b+c digging 2a=8,a+2b=a,b+2c=b

a=4, b=c=0 The original 3-digit number is 400 (4-digit number town 8400=21*400).

That's how it should be.

The original number is like ab5, and the new number is like 5ab.

then 5ab - ab5 = 342

B = 7 is first pushed from b - 5 = 2, which becomes :

5a7 - a75 = 507 + 10a - 100a + 75) = 342

Solution A = 1

The original number is 175

Solution: Let the original two-digit number be 10a+b, then the new two-digit number is 10b+a, and their sum is 10a+b+10b+a 11 (a+b), because this sum is a square number, it can be determined that a+b 11, so this sum is 11 11 121