练习  输入三条边长如果能构成三角形就计算周长和面积 import math a,b,c = input().split(',') a = float(a) b = float(b) c = float(c) if a + b > c and a + c > b and b + c > a: print('周长%f'%(a + b + c)) p = (a + b + c)/2 area = math.sqrt( p * ( p - a ) * ( p - b )*( p - c ))…