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    3×2.1×12-(3-0.49×2)×(2.1-0.49×2)×12
    sin(3.14*0.39)
    (251.26×10^3)/1766
    (60+150+40)×(1+12%)
    2437.94×10×0.003
    25×(1+10%)×(1+6%)×(1+25%)×(1+4%)×(1+11%)
    (150×50+20×1500×60%)×(1+4%)×(1+11%)
    [24+21×(1+10%)×(1+6%)]×(1+4%)×(1+11%)
    237.08×1×1.25×7/sin45
    (220-210)×10000-70000
    (600×150+50×1500+160000)×1.1×1.06×1.3×1.13
    (600×150+50×1500+160000)×1.1×106×1.3×1.13
    360×30%×800×(1+20%)×(1+13%
    392.4/(1+9%)
    (50×150+5×1200+35000)×(1+20%)×(1+25%)×(1+13%)
    (110×150×60%+20×1200×70%)×(1+13%)+3000×(1+20%)×(1+13%)+1600×(1+13%)
    610059.37×1.3
    4210.27+(3600-3500)×1.02 (130÷1.02)×4312.27×1.11
    0.00075*0.00075
    {【(5060+1792)×(1+40%)+27148】×(1+30%)+10×1100×60%}×(1+11%)

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