[2 7/15-(8.5-1/3/3.5)]*7.5
[2 7/15-(8.5-1/3/3.5)]*7.5 =[9/5-17/2+1/3*2/7]*15/2 =9/5*15/2-17/2*15/2+2/21*15/2 =27/2-17*15/4+15/21 =(27*2-17*15)/4+15/21 =-171/4+15/21 =-1171/4
答:[2又5分之3-(8.5-2又3分之2)÷3.5]×7又2分之1=? ={(13/5)-[(17/2)-(8/3)]/(7/2)}*(15/2) ={(13/5...详情>>
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