задача 10

 #

d = float(input("введи d = "))

print("s =", s)

print("sr =", sr)

a = float(input("введи a = "))

sr = (a+b+d)/3

  print("s =", s)

s = (a+b+d)/3

b = float(input("введи b = "))

c = float(input("введи c = "))