[﹙﹣9/14﹚-1又5/7+8/21]÷﹙﹣1/42﹚
问题描述:
[﹙﹣9/14﹚-1又5/7+8/21]÷﹙﹣1/42﹚
答
[﹙﹣9/14﹚-1又5/7+8/21]÷﹙﹣1/42﹚
=[﹙﹣9/14﹚-1又5/7+8/21]×(-42)
=﹙﹣9/14﹚×(-42)-1又5/7×(-42)+8/21×(-42)
=27+72-16
=83