将下列分数按升序排列:$\frac{1}{2},\ \frac{4}{5},\ \frac{-2}{3},\ \frac{-1}{2},\ \frac{-5}{7}$。
已知:分数:$\frac{1}{2},\ \frac{4}{5},\ \frac{-2}{3},\ \frac{-1}{2},\ \frac{-5}{7}$。
要求:将给定的分数按升序排列。
解答:
给定分数:$\frac{1}{2},\ \frac{4}{5},\ \frac{-2}{3},\ \frac{-1}{2},\ \frac{-5}{7}$。
分母2、5、3、2、7的最小公倍数LCM = 210
$\frac{1}{2}=\frac{1}{2}\times\frac{105}{105}=\frac{105}{210}$
$\frac{4}{5}=\frac{4}{5}\times\frac{42}{42}=\frac{168}{210}$
$\frac{-2}{3}=\frac{-2}{3}\times\frac{70}{70}=\frac{-140}{210}$
$\frac{-1}{2}=\frac{-1}{2}\times\frac{105}{105}=\frac{-105}{210}$
$\frac{-5}{7}=\frac{-5}{7}\times\frac{30}{30}=\frac{-150}{210}$
将给定分数按升序排列:
$\frac{-150}{210}<\frac{-140}{210}<\frac{-105}{210}<\frac{105}{210}<\frac{168}{210}$。
因此,$\frac{-5}{7}<\frac{-2}{3}<\frac{-1}{2}<\frac{1}{2}<\frac{4}{5}$。
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