10000*0.84*0.9*7/10+10000*0.84*0.9*3/10*6/10*100+10000*0.84*0.9*3/10*4/10*5/10
    ln4
    ln8
    8/e
    1/2*550/0.6*0.08^2
    850*850
    0.5/(293/101.29)^(1.1518/0.1518)
    (293/101.29)^(1.1518/0.1518)
    0.5/3163.551372
    47.76/2/8.5
    51*2-2*8.5*9.8*sin19
    51*2-8.5*9.8*sin19
    10^9
    71.33/180*3.14*0.04-0.189*0.071-3.14*0.04*0.3
    189.47^2+64^2
    200*sin71.33
    arccos0.32
    (1-0.175)*7/10+(1-0.175)*3/10*6/10+(1-0.175)*3/10*4/10*5/10
    (1-0.175)*7/10(1-0.175)*3/10*6/10+(1-0.175)*3/10*4/10*5/10
    （227.37-222）/（227.37-221.96）

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