五、比和比例［复习要求］１．理解比和比例的意义、性质；掌握比与分数、除法的关系；能熟练地求比值，化简比求比的未知项和解比例。２．能熟练地解答按比例分配的应用题；能根据比与分数关系，通过比与分数的互相转化解答有关综合应用题。３．理解比例尺的意义，掌握＂... Fifth, ratio and proportion [review requirements] 1. Understand the meaning and nature of proportions and proportions; the relationship between mastery ratios and scores, divisions; and the proportion of unknown terms and solutions that skillfully seek ratios and reduce ratios. 2. Ability to answer proficient application questions; able to rely on comparisons with scores, through translating answers with scores on synthetic questions. 3. Understand the meaning of scale and master "...