#!/usr/bin/python
# -*- coding: UTF-8 -*-

a = 20
b = 10
c = 15
d = 5
e = 0

e = (a + b) * c / d  # ( 30 * 15 ) / 5
print "(a + b) * c / d 运算结果为：",  e

e = ((a + b) * c) / d     # (30 * 15 ) / 5
print "((a + b) * c) / d 运算结果为：",  e

e = (a + b) * (c / d)    # (30) * (15/5)
print "(a + b) * (c / d) 运算结果为：",  e

e = a + (b * c) / d  # 20 + (150/5)
print "a + (b * c) / d 运算结果为：",  e