在高中物理、化学、生物习题中,有些问题属于数列问题。解答这类问题,一般要用数列的通项公式及求和公式,甚至有时还要进行极限运算。解题的关键是能够通过分析题意,将问题转化为数列模型。为了开拓同学们的解题思路,现举例说明如下:一、利用通项公式例1.生物学中指出:生态系统中,在输入一个营养级的能量中,大约只有10%—20%的能量能够流动到下一个营养级(称为能量传递率)。在 H_1→H_2→H_3→H_4→H_5→H_6这条生物链中,若使 H_6获得10KJ 的能量,则需要 H_1最多提供的能量是(A)10~4KJ (B)10~5KJ (C)10~6KJ (D)10~7KJ In high school physics, chemistry, and biological problems, there are some problems that belong to the sequence. In order to answer such questions, it is generally necessary to use the general term formulas and sum formulas of the series, and even limit calculations. The key to problem solving is to be able to convert questions into a series model by analyzing the meaning of the questions. In order to open up students’ problem-solving ideas, examples are as follows: 1. Using the general term formula 1. In biology, it is pointed out that in an ecosystem, only about 10% to 20% of energy is input to a trophic level of energy. Can flow to the next trophic level (called energy transfer rate). In the bio chain of H_1→H_2→H_3→H_4→H_5→H_6, if H_6 is given 10KJ of energy, the energy provided by H_1 is the maximum (A) 10~4KJ (B) 10~5KJ (C)10 ~6KJ (D)10~7KJ