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又称作“浓度问题”的“质量分数问题”,多涉及到列二元一次方程组解应用题,虽然因为“初三化学中要学”等原因而被从一些地区、一些数学教材中删去,但仍在一些地区和一些数学教材中被保留着,在中考中这些地区仍然有这类试题,并与时俱进地产生了变化和发展,从全国范围来讲,涉及的面并不算小,编发此文正是为了让这些地区的读者对相关题型的变化趋向有所了解,也给其他地区的读者提供参考与借鉴。
The “mass fraction problem”, also known as the “concentration problem,” involves a series of equations that are applied to equations of binary equations, although they have been deleted from some regions and some mathematics textbooks because of reasons such as “in the third grade chemistry.” Go, but still being preserved in some regions and some mathematics textbooks. In the mid-term exams, these areas still have such questions and have changed and developed with the times. From a national perspective, the aspects involved are not This article is intended to help readers in these regions understand the trends of the relevant questions and to provide reference and reference for readers in other regions.