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在实际生活与生产实践及科学研究中,常会遇到已知第一个量同第二个量的相比关系,第二个量同第三个量的相比关系,第三个量同第四个量的相比关系,……,求最后一个量与第一个量的相比关系,以解有关比例的问题,这种问题叫做连锁比例问题。例1 2斤一级茶的价钱等于3斤二级茶的价钱,4斤二级茶的价钱等于5斤三级茶的价钱。已知7斤一级茶的价钱为420元,问10斤三级茶的价钱是多少元?这是一道简单的连锁比例问题,根据题意,我们先分步解答,逐个解决:解已知7斤一级茶的价钱为420元,设2斤一级茶的价钱为x元。
In the actual life and production practice and scientific research, we often encounter the known first quantity compared with the second quantity, the second quantity is compared with the third quantity, the third quantity is the same with the The relationship between the four quantities, ..., find the last volume compared with the first volume to solve the problem of proportion, this problem is called the chain ratio problem. Example 1 2 pounds a tea is equal to the price of 3 pounds of second-class tea, 4 pounds of second-class tea is equal to 5 pounds of third-class tea price. Known a price of 7 pounds a tea is 420 yuan, ask 10 pounds three tea price is how many yuan? This is a simple chain ratio problem, according to the title, we first step by step answer, one by one to solve: Known known 7 kg a tea price of 420 yuan, set 2 pounds a tea price is x yuan.