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学习“圆和扇形”这一部分知识,孩子们最感到困难的是,涉及的公式太多,尤其字母公式都十分相似,难读,更难记。不少家长以为让孩子背的公式越多,他的解题能力就越强。于是就整理了十多个公式让孩子背诵,例如:r=1/2d、r=c÷π÷2;在=2r、d=c÷π……其实,背的公式过多、过繁,加之孩子没有很好地理解,抓不住这些公式的实质及相互联系,临到用时常常会张冠李戴,闹出种种笑话。
Learn the “circle and fan” this part of the knowledge, the children most difficult is involved in too many formulas, especially the formula of the alphabet are very similar, difficult to read, more difficult to remember. Many parents think that the more formulas children have, the stronger their ability to solve problems. For example: r = 1 / 2d, r = c ÷ π ÷ 2; at = 2r, d = c ÷ π ...... In fact, the back of the formula too much, too complicated, Coupled with the children do not have a good understanding, can not grasp the essence of these formulas and interrelationships, the use of time and time often wear, make all kinds of jokes.