#!/usr/bin/python3 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)