Question

Gaseste toate numerele naturale 3a8b1 cu suma cifrelor 20 si ordoneaza-le descrescator

Answer 1

Răspuns:

38801,37811,36821,35831,34841,33851,32861,31871,30881

Explicație pas cu pas:

3a8b1

a, b cifre

a,b ∈{0,1,2.....9}

3 + a + 8 + b + 1 = 20 => a + b +  12 = 20 => a + b = 20 - 12 => a + b = 8

a = 0 => b = 8

a = 1 => b = 7

a = 2 => b = 6

a = 3 => b = 5

a = 4 => b = 4

a = 5=> b = 3

a = 6 => b = 2

a = 7 => b = 1

a = 8 => b = 0

38801,37811,36821,35831,34841,33851,32861,31871,30881