The difference of the greatest and the least 4 – digit number can you make using all digit 9;3;0;7 is ?

The difference of the greatest and the least 4 – digit number can you make using all digit 9;3;0;7 is 

The difference of the greatest and the least 4 – digit number can you make using all digit 9;3;0;7 is

999 divided by 3 is the same as 9 times M. Find M

The difference of the greatest and the least 4 – digit number can you make using all digit 9;3;0;7 is     ?

-The difference of the greatest and least 4_digit number can you make using all digit 9;3;0;7 is ..?..

-2x2x2...=2⁵

^{The missing number is ..?..}

cho mình hỏi 2 câu này: 

Question 1:
The difference of the greatest and the least 4 – digit number can you make using all digit 9;3;0;7 is ......

Question 2:
When X divided by 234, the remainder is the greatest possible remainder and the quotient is 5. 
The value of X is ..........

From 4 letters ab18 one can make all 18 numbers with 4 digits. (In a number, each digit is written only once.) The sum of all 18 possible numbers is 90216. Find a and b.

the greatest factor of a number is the greatest 2- digit number