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)
    11.23/〖8.9〗^1.28
    1.041×2375/742.2×3.37
    28.184+0.0025×323.4
    323.4×〖8.9〗^(1.38-1)
    0.165×〖8.9〗^1.38
     (1.8*10^(-5)*1.413*10^(-3))/10^(-5.5)
    8.9/(8.9-1)×0.1518/0.1013×288/323.4×1/(1+0.04)
    (1.8*10^(-5)*0.001413)/10^(-5.5)
    10^(-4.3)*28.2

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