cisla = [1.12, 4.51, 2.64, 13.1, 0.1]

# 1
cisla1 = [cislo * 2 for cislo in cisla]
print(cisla1)

# 2
cisla2 = [cislo * -1 for cislo in cisla]
print(cisla2)

# 3
cisla3 = [cislo ** 2 for cislo in cisla]
print(cisla3)

# 4
cisla4 = [str(cislo)  for cislo in cisla]
print(cisla4)