Giúp mình giải bài toán bằng tiếng anh với. Mình cảm ơn nhiều!

Bài 1. The number of fractions m/n such that m + n = 2016 is..........?

Bài 2. Using each of the digits 2,3,5 and 6 exactly once, form two 2-digit numbers. What is the difference between the largest possible product  anf smallest possible product of two suchnumber?

the sum of the digits of a two-digit number is 11. when you reverse its digits you decrease the number by 9 . Find the number

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 sum of 2018 and a 3-digit number is a square number. Find the smallest possible value of the 3- digit numbers

a) find the next two term in the sequence: 1; 4; 9; 16; 25;....;.....;
Answer: 
b) find the smallest two-digit number whose number is 7 times the sum of its digits? 
Answer:

A 4-digits number is divisble by all of the numbers from 1 to 10 ưithout any remainder .

find the smallest possible value of the 4 - digit number 

in a 4-digit number, the ones digit is the possible largest number, the hundreds digit is the smallest odd number and the tens digit is 1 more than the hundreds digit. The thousands digit is the sum of the hundreds and the tens digit. Find the number

In a 4- digit number. The ones digit is the possible  largest number, the hundreds digit is the smaller odd number and the tens digit is 1 more thann the hundreds digit. The thousands digit is the sum of the hundreds and the tens digit. Find the number.