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分式运算是初中代数中常见的问题之一,也是中考的热点,旨在考查计算能力。分式的化简求值是一种重要题型,通常情况都是按照加、减、乘、除的顺序先将分式化简,然后再将指定的字母的值代入求值,但在近年的中考题中,出现了一类“改良”化简求值题:即分式化简后,字母的值并不确定,而是让考生按照一定的条件自己选一个合适的值代入求值。
Fractional arithmetic is one of the common problems in junior high school algebra, but also a hot spot in the exam, designed to test the computing power. The fractional reduction is an important problem, usually in accordance with the order of addition, subtraction, multiplication and division of the first reduction of fractionation, and then assigned to the value of the specified letter, but in recent years In the senior high school entrance examination questions, there has been a class of “improved ” reduced the value of the problem: that is, after the fractional simplification, the value of the letter is not certain, but let the candidates according to certain conditions, choose a suitable value of their own substitution value.