总述：本次共解1题。其中
           ☆算术计算1题

〖1/1算式〗
    作业：求算式 100-20*log(10,12.79)-20*log(10,sqrt(1+12.79*12.79))+20*log(10,sqrt(1+12.79*12.79/4))-40*log(10,sqrt(1+12.79*12.79/625)) 的值.
    题型：数学计算
    解:
          100-20*log(10,12.79)-20*log(10,sqrt(1+12.79*12.79))+20*log(10,sqrt(1+12.79*12.79/4))-40*log(10,sqrt(1+12.79*12.79/625))
        =100-20*1.106871-20*log(10,sqrt(1+12.79*12.79))+20*log(10,sqrt(1+12.79*12.79/4))-40*log(10,sqrt(1+12.79*12.79/625))
        =100-20*1.106871-20*log(10,sqrt164.5841)+20*log(10,sqrt(1+12.79*12.79/4))-40*log(10,sqrt(1+12.79*12.79/625))
        =100-20*1.106871-20*1.108194+20*log(10,sqrt(1+12.79*12.79/4))-40*log(10,sqrt(1+12.79*12.79/625))
        =100-20*1.106871-20*1.108194+20*log(10,sqrt41.896025)-40*log(10,sqrt(1+12.79*12.79/625))
        =100-20*1.106871-20*1.108194+20*0.811086-40*log(10,sqrt(1+12.79*12.79/625))
        =100-20*1.106871-20*1.108194+20*0.811086-40*log(10,sqrt1.261735)
        =100-20*1.106871-20*1.108194+20*0.811086-40*0.050484
        =100-22.13742-20*1.108194+20*0.811086-40*0.050484
        =100-22.13742-22.16388+20*0.811086-40*0.050484
        =100-22.13742-22.16388+16.22172-40*0.050484
        =100-22.13742-22.16388+16.22172-2.01936
        =77.86258-22.16388+16.22172-2.01936
        =55.6987+16.22172-2.01936
        =71.92042-2.01936
        =69.90106
    答案:100-20*log(10,12.79)-20*log(10,sqrt(1+12.79*12.79))+20*log(10,sqrt(1+12.79*12.79/4))-40*log(10,sqrt(1+12.79*12.79/625))=69.90106

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