求10+9+8+7+…+ 1 =?s=()for i in range( ):s =()print( "10+9+8+7+…..+ 1=", s )
for i in range(10, 0, -1): s = s + i
s = 0 for i in range(10, 0, -1): s += i print("10+9+8+7+...+1 =", s)