什么叫替换?具体就是将一个等式或者变量,用另一个变量或者等式来代替,然后带回原来的题目中,可以起到简化计算的效果。在我们小学数学课本中,关于替换方面的练习题还不少呢,做这样的习题很有趣。下面就让老师带着大家,做做替换方面的练习题。请同学们先看这样一道有趣的数学题:3支钢笔和4本练习本共计8元;钢笔的单价是练习本单价的4倍,你知道钢笔和练习本的单价各是多少元?在解决这道题的时候,我们可以把4本 What is the replacement? Specifically is an equation or variable, with another variable or equation to replace, and then back to the original title, can play a simplified calculation results. In our elementary math textbooks, there are not many exercises on replacement, so it is interesting to do such exercises. Let the teacher let everyone below, do replacement exercises. Please take a look at this interesting mathematical math problem: 3 pens and 4 practice books totaling 8 yuan; pen price is 4 times the exercise price of the unit, you know how many pen and exercise book unit price? In the solution When this question, we can put four