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The fifth-grade students will not ask you to teach if they have problems, and they will not explain the process clearly. Thank you.
Solution: [9 ÷ (6-1) ]× (12-1) =1.8×1=19.8 (.

Don't write the answer, hope to adopt it.

0.8×60=48 seconds if the topic is written in minutes and seconds.

Answer 19 minutes and 48 seconds

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