name = input("输入姓名")
print("{}同学,好好学习,天天向上".format(name))
a=input("请输入a:")
b=input("请输入b:")
print(float(a)+float(b))
a=input("a=")
b=input("b=")
c=input("c=")
l=(float(a)+float(b)+float(c))/2
d=float(l)*(float(l)-float(a))*(float(l)-float(b))*(float(l)-float(c))
s=float(d)**0.5
print(float(s))
r=input("请输入r=")
s=3.14*float(r)*float(r)
print(float(s))
import turtle
turtle.circle(10)
turtle.circle(20)
turtle.circle(30)
turtle.circle(100)
import turtle
for i in range(5):
turtle.forward(100)
turtle.right(144)
import turtle
turtle.fillcolor("yellow")
turtle.begin_fill()
for i in range(5):
turtle.forward(100)
turtle.right(144)
turtle.end_fill()