0.45*10^3*1.1*200*1732
    cos6.378733
    cos6.3938
    cos2.9781
    cos6.4054
    cos0.138745
    cos6.446612
    128-64e+8e2-e4
    (1*(1000*3.5%)/(1+4%)+2*1*(1000*3.5%)/(1+4%)^2+3*1*(1000*3.5%)/(1+4%)^3+4*1*(1000*3.5%)/(1+4%)^4)/981.85
    arctan(2×2.55）-arctan (0.199×2.55÷（1-0.25×2.55×2.55））
    (100*7%+(103.47-97.34))/97.34
    1+17.5%/1+53%
    14.1%*(1+17.5%/1+53%)
    arctan（0.5×6.17）
    [（120+100+240+180+200+180+80+160）/20]*1000
    80-16
    84+18/6
    480000/( 2000000/10)
    480000/( 4000000*8%)
    (480000-144000)/( 4000000*8%)

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