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分数的大小比较问题在学习中屡见不鲜.解答这类问题,除了要掌握常规的分母化相等比较分子的方法外,还应掌握一些切实可行的变形策略.下面介绍几种,供参考.一、分子化相等变形例1有理数-3/11、-5/19、-6/23中,用“<”符号将它们连接起来为.解析:利用分母化相等比较分子的方法,运算量太大,此法不可取.注意到已知三个分数分子的最小公倍数较小,仅为30,故考虑利用分子化
Comparison of the size of the scores in the study is not uncommon solution to such problems, in addition to master the conventional method of denominator equal comparison of molecules, but also should have some practical deformation strategy. Here are a few for reference. Equivalent Modification 1 rational number -3 / 11, -5 / 19, -6 / 23, with the symbol “” to connect them as. Analysis: The use of equalization method to equalize the numerator is too large , This method is not desirable.Note that it is known that the least common multiple of the three fractional numerator is only 30, so the use of molecularization