填空:$( \frac{15}{7}\times \frac{-21}{10}\times \frac{-5}{6})$=$( \frac{-21}{10}\times\frac{-5}{6})\times$____
已知:$( \frac{15}{7}\times \frac{-21}{10}\times \frac{-5}{6})$=$( \frac{-21}{10}\times\frac{-5}{6})\times$____
要求:填空。
解答
$( \frac{15}{7}\times \frac{-21}{10}\times \frac{-5}{6})$=$( \frac{-21}{10}\times\frac{-5}{6})\times \boxed{\frac{15}{7}}$ [$\because a\times b\times c=b\times c\times a$]
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