如果一个果包的价格是果包的两倍,而果包的价格是果包的价格,减去果包,那么买一束和果包会花多少钱?
我们可以开始分配变量来表示不同物品的价格.让a是果袋的价格,b是香包的价格,c是香包的价格,d是枣盒的价格.现在,我们可以使用在问题中提供的信息来创建一个线性方程系统:a + b + c + d = 20 (所有物品的总成本) 2a = d (一枣包的价格是果袋的价格的两倍) a - b = c (一果包的价格是果袋的价格减去香包的价格),我们可以用第二方程来解决a: 2a = d = a = d/2 然后我们可以用第三方程来替代这个表达式:a + b + c + d = 5b + c = 20b + c = 5b + c = 20b + c = 5b + c = 20b + c = 5b + c = 5b + c = 5b + c = 5b + c = 20b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c = 5b + c + c = 5b + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c + c)         