20000-19462.97
    16871.08+40+32.54+475.00+800+200+1000+21.85+22.50
    2.05+30.49
    3.43*500*6
    0.2272+0.9822+0.5644+1.6643
    16.67×4.10×300
    0.2272+0.9822.0.5644+1.6643
    1.6643*80*6
    16.67×0.00726×300×1000
    1.6643*（250-170）
    14/82
    383*0.2272*7+290*0.9822*7+290*0.5644*7+170*1.6643*7
    1/3*(1/3-1/4)÷0.5
    lg(262.2/0.25)*12.05*262.5/4.82
    sin60
    (3.6×10^6)/(0.35×43896.56)
    (3.6×10^6)/(0.404×43896.56)
    8.294×(0.85×0.512×288×1.64)/(43896.56×0.1013×0.949)=
    0.97×3.37/(8.9-1) [3.33×(1-1)+(3.33×1)/(1.28-1) (1-1/〖8.9〗^(1.28-1) )-1/(1.38-1) (1-1/〖8.9〗^(1.38-1) )]
    2375/〖8.9〗^(1.28-1)

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