Find the polynomials such that:



.

Prove that for any set of integers , there is a subset of them whose sum is divisible by .

(I have one solution,but I think there exist many for this one)

Let and be real numbers such that , and . Prove that
$a^{p}b^{q}...

Let such that , ,.Prove that

Пусть M[x] равно числу несократимых дробей a/b таких что, a<=x и b<=x, где a и b - натуральные числа. Вычислите сумму...