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Mathematics in the first volume of the first day of junior high school
A two-digit number, where the ten digits are x and the digits are X- 1. What is the two-digit number obtained by exchanging ten digits with digits?

2. The little mother took Mi Yuan to the street to buy food. She spent half on meat and the remaining third on vegetables. So how much money does she have left?

Related answers:

The first question: 1 1X- 10

Question 2: M-m/2-m/2/3= 1/3M yuan.

As shown below, what is the fifth number in line 100?

1

2 3

4 5 6

7 8 9 10

1 1 12 13 14 15

16 17 ........

The answer is 4955.

From the outermost layer on the left of the graph,1247116, the number after it is always greater than the number before it.

The second ratio is 1 large 1 ... the third is 2 ... the fourth is 3 ... the fifth is 4 ... the sixth is 5. .......... is greater than the fifth, so we can set the nth number of the outermost layer on the left as X, and then X is equal to [1 plus 2 plus 3 plus.