Let 6-digit 1abcde & nbsp; multiply by 3 to become 6-digit abcde1

Let 6-digit 1abcde & nbsp; multiply by 3 to become 6-digit abcde1

Let ABCDE be X. according to the equation of the title, we can get: 3 = 10x + 1, & nbsp; & nbsp; & nbsp; 300000 + 3x = 10x + 1, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 10x-3x = 299999, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 7x = 299999, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 42857, so this six digit number is 142857. A: 1abcde is 142857

It is known that the average of nine numbers is 72. After one number is removed, the average of the remaining numbers is 78, and the number removed is 78______ ．

The sum of 9 numbers: 72 × 9 = 648, the sum of the remaining 8 numbers: 78 × 8 = 624, the number removed is: 648-624 = 24

It is known that the average of nine numbers is 72. After one number is removed, the average of the remaining numbers is 78, and the number removed is 78______ ．

The sum of 9 numbers: 72 × 9 = 648, the sum of the remaining 8 numbers: 78 × 8 = 624, the number removed is: 648-624 = 24

It is known that the average of nine numbers is 72. After one number is removed, the average of the remaining numbers is 78, and the number removed is 78______ ．

The sum of 9 numbers: 72 × 9 = 648, the sum of the remaining 8 numbers: 78 × 8 = 624, the number removed is: 648-624 = 24

It is known that the average of nine numbers is 72. After one number is removed, the average of the remaining numbers is 78, and the number removed is 78______ ．

The sum of 9 numbers: 72 × 9 = 648, the sum of the remaining 8 numbers: 78 × 8 = 624, the number removed is: 648-624 = 24

If 13 of the sum of four rational numbers is 4, and three of them are - 12, - 6, 9, then the fourth number is ()
A. -9B. 15C. -18D. 21

Let the fourth number be X. from the meaning of the question, we can get: 13 [- 12 + (- 6) + 9 + x] = 4, we can get: 13 (X-9) = 4, the solution is: x = 21, so we choose D

If 1 / 3 of the sum of four rational numbers is 4, and three of them are negative 12, negative 6, and negative 9, then the fourth number is?

21

If 13 of the sum of four rational numbers is 4, and three of them are - 12, - 6, 9, then the fourth number is ()
A. -9B. 15C. -18D. 21

Let the fourth number be X. from the meaning of the question, we can get: 13 [- 12 + (- 6) + 9 + x] = 4, we can get: 13 (X-9) = 4, the solution is: x = 21, so we choose D

If we know that the sum of four rational numbers is 12, and three of them are - 10, + 8 and - 6, then the fourth number is?

20

If the average of data m, 2, 5, 7, 1, 4 and N is 4, then the average of M and N is? () a, 7.5B, 5.5c, 2.5D and 4.5c

D、4.5