Answer:
You didn't state the pattern in which you like the expressions to be written. I wrote it nevertheless, and hope that this can help find an answer to your problem if this isn't exactly what you are trying to find.
Step-by-step explanation:
1. The expressions that result to
9 - 8 = 1
7 - 6 = 1
5 - 4 = 1
3 - 2 = 1
2. The results that result to 9.
8 + 1 = 9
7 + 2 = 9
6 + 3 = 9
5 + 4 = 9
Answer:
As you can read below, we can write expressions for addition and subtraction, but not for multiplication and division.
Step-by-step explanation:
We can find out examples for addition and subtraction, this way:
1. Addition:
1 + 8 = 9 1 + 7 = 8 1 + 6 = 7 1 + 5 = 6 1 + 4 = 5
2 + 7 = 9 2 + 6 = 8 2 + 5 = 7 2 + 4 = 6 2 + 3 = 5
3 + 6 = 9 3 + 5 = 8 3 + 4 = 7
4 + 5 = 9
2. Subtraction:
9 - 1 = 8 9 - 2 = 7 9 - 3 = 6 9 - 4 = 5
8 - 1 = 7 8 - 2 = 6 8 - 3 = 5
7 - 1 = 6 7 - 2 = 5
6 - 1 = 5
For multiplication and division we inevitably will repeat any of the digits, like these examples:
8 * 1 = 8 (8 is repeated and therefore not a valid example)
4 * 2 = 8
9 ÷ 3 = 3 (3 is repeated and therefore not a valid example)
3 ÷ 1 = 3 (3 is repeated and therefore not a valid example)
