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学习数学,许多概念、定理、公式必须记忆。但中学六年,教科书十多本,数学概念、定理、公式数以千计,这么多知识,怎样才能记熟、用活? 有的老师认为,青少年学生记忆力强,应该让他们多记一些知识,于是把许多次要的知识也向学生头脑中塞。我曾经在一个高中普通班听了一堂等差、等比数列的复习课。教师罗列了不少公式要学生记。例如,等差数列求和公式,不仅要记 Sn=((a_1+a_n)n)/2,……………………(1) 还要记 Sn=na_1+(((n(n+1)))/2)d。………… (2) 等比数列求和公式,不仅要记 Sn=((a_1(1-q~n)))/(1-q),……………(3) 还要记
Learning mathematics, many concepts, theorems, formulas must remember. However, there are more than 10 textbooks, tens of thousands of textbooks, mathematical concepts, theorems and formulas in so many years. There are so many kinds of knowledge that we can learn from them. Some teachers think that young students should remember more and remember more , So much secondary knowledge is also plugged into the minds of students. I was in an ordinary high school class listened to a poor, equal sequence review class. Teachers listed a lot of formulas for students to remember. For example, the equation of sums of difference columns should not only be written Sn = ((a_1 + a_n) n) / 2, but also Sn = na_1 + (((n (n + 1 )))) / 2) d. ............ (2) The geometric summation sequence, not only to remember Sn = ((a_1 (1-q ~ n))) / (1-q), ...............