计算和化简是中学生学习数学的两大基本功。计算是解题的工具,化简则常常不仅是题目本身的要求,而且是解答许多题目的必经之路。例如,求值题、化简题、证恒等式、解方程等都离不开化简和计算。一个新的概念、新公式常常要从最简形式研究,而复杂的式子则常常要先化成最简形式然后再进行解答。每次数学考试结束,常听到一些学生说:题目我都会,就是好 Computation and simplification are two basic skills for secondary school students to learn mathematics. Computation is a tool for solving problems, and simplification is often not only a requirement of the subject itself, but also the only way to answer many questions. For example, evaluation questions, simplification problems, card identity, equations and other solutions are inseparable from the simplification and calculation. A new concept, the new formula often from the most simple form of study, and complex formulas are often first into the most simple form and then answer. Every time after the end of the math test, I often hear some students say: I will be the subject, that is good