问题标题:
数学题之57用递等式计算.1.15/4*12/5-12/5/120%2.100.1-(2.625+0.425)*303.99/{23/4-(9/5+21/5*2/7)}4.(1/4+3/8)/(1-3/10)
问题描述:

数学题之57

用递等式计算.

1.15/4*12/5-12/5/120%2.100.1-(2.625+0.425)*30

3.99/{23/4-(9/5+21/5*2/7)}4.(1/4+3/8)/(1-3/10)

李荣冰回答:
  用递等式计算.   1.15/4*12/5-12/5/120%   =9-2   =7   2.100.1-(2.625+0.425)*30   =100.1-3.05*30   =100.1-91.5   =8.6   3.99/{23/4-(9/5+21/5*2/7)}   =99/[23/4-3]   =99/11/4]   =36   4.(1/4+3/8)/(1-3/10)   =5/8/(7/10)   =25/28
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