学习了二元一次方程组后,我们可以通过设两个未知数,列二元一次方程组来解未知量较多的题目．这虽然解决了如何处理多个未知量的问题,但是又使我们面临着如何在多个量之间找到等量关系这个难题．其实,当我们遇到较为复杂的数量关系时,借助图表将文字条件表现为代数式, 是探寻量与量之间关系非常直观有效的方法。 After learning the binary equations, we can solve the problem with more unknowns by setting two unknowns and two binary equations. Although this solves the problem of how to deal with multiple unknowns, it also gives us the problem of how to find equal relationships between multiple quantities. In fact, when we encounter more complex quantitative relationships, using graphs to represent literal conditions as algebraic is a very intuitive and effective way to explore the relationship between quantity and quantity.