9*(1-2/5÷9/20﹚÷3/20-1又3/7

问题描述:

9*(1-2/5÷9/20﹚÷3/20-1又3/7
1/5÷[﹙2/3+20%﹚*1/13]
8*3又1/7÷[1÷﹙3又1/5﹣2.95﹚]

9*(1-2/5÷9/20﹚÷3/20-1又3/7=9*(1- 2/5 × 20/9)×(20/3) - 1又3/7=9*(1- 8/9)×(20/3) - 1又3/7=9*(1/9)×(20/3) - 1又3/7=20/3 - 1又3/7=7 - 1/3 - 1 - 3/7=6 - 7/21 - 9/21=6 - 16/21=5又5/21.1/5÷[﹙2/...