Put the nine numbers from 11 to 19 in nine squares and make them equal to 45

Put the nine numbers from 11 to 19 in nine squares and make them equal to 45

16 11 18
17 15 13
12 19 14

What are the three numbers that add up to 21?

To see the range of numbers (natural number range, rational number range, real number range, complex number range) in addition to the natural number range, there are no arrays
For example: 1 + 2 + 19 = 21 -1+2+20=21…… 0+20+1=21…… 1/3+20+2/3=21……

The smallest number that can be divided by 15 and 18 at the same time is______ This number is called the sum of the two numbers______ ．

(1) 15 = 3 × 5, 18 = 2 × 3 × 3, so the least common multiple of 15 and 18 is 3 × 2 × 5 × 3 = 90; (2) 90 is the least common multiple of 15 and 18; so the answer is 90, the least common multiple

What is the minimum number that a number can be divided by 3,8,12 at the same time
The formula must be

The least common multiple of 3,8,12 is 24
The minimum number is 24

Use 2,5,8 to get rid of the smallest fraction that can be divisible

2. The least common multiple of 5 and 8 is 40
So the number is 40

There is a number that can be divided by 5, 8 and 10. What is the minimum number?

40

If you use a number to divide 18 and 24, you can exactly divide them. What's the biggest number

If you use a number to divide 18 and 24, you can exactly divide them. The largest number is 6