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同学们都听说过《三国演义》中“草船借箭”的故事吧:周瑜为难诸葛亮,向他提出十天之内造出十万支箭的无理要求。在一个大雾弥漫的晚上,诸葛亮用载有草人的船驶向曹军,生性多疑的曹操下令放箭,让诸葛亮不费一兵一卒就从曹操手里获得十万支箭。诸葛亮之所以轻而易举地完成了周瑜布置的难题,就是因为他能巧用一个“借”字,收到了“四两拨千斤”的功效。其实,在解答有些数学题时,当题目的条件不明朗或是相对较为复杂的时候,我们不妨学一学诸葛亮,也去“借”一下,以便寻得解决问题的新途径。“借”一个数字,让题目的条件更充分
Students have heard of “Romance of the Three Kingdoms” in the “boat by the arrow” story: Zhou Yu Zhuge Liang embarrassed, made to him within ten days to create one hundred thousand arrows of unreasonable demands. In a foggy night, Zhuge Liang sailed Cao Cao with a vessel carrying Cao Cao. Cao Cao, a naturally suspicious man, ordered the release of an arrow so that Zhuge Liang could get 100,000 arrows from Cao Cao without any expense. The reason why Zhuge Liang easily completed the arrangement of Zhou Yu is because he can skillfully use the word “borrowed” and received the effect of “deflecting away from him”. In fact, when answering some math questions, when the subject conditions are not clear or relatively complicated, we might as well learn Zhuge Liang and go to borrow to find new ways to solve the problem. “Borrow ” a number, so that the conditions of the topic more fully