將下列有理數按降序排列
$- \frac{3}{10} , \frac{-7}{-5}, \frac{9}{-15}, 1\frac{8}{30}$。
已知:
給定的數字是
$- \frac{3}{10} , \frac{-7}{-5}, \frac{9}{-15}, 1\frac{8}{30}$。
任務:將下列有理數按降序排列
解
=$-\frac{3}{10} ,\frac{-7}{-5}, \frac{9}{-15}, 1\frac{8}{30}$。
=$-\frac{3}{10} ,\frac{7}{5}, \frac{-3}{5}, \frac{38}{30}$。
=10, 5, 15, 30的最小公倍數是30
=$\frac{-3\times3}{30} ,\frac{7\times6}{30},\frac{-3\times6}{30},\frac{38}{30}$
=$\frac{-9}{30} ,\frac{42}{30},\frac{-18}{30},\frac{38}{30}$
降序排列為
$\frac{42}{30}, \frac{38}{30},\frac{-9}{30},\frac{-18}{30}$
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