x-x/1.01*0.01-x/1.01*0.01*0.07*0.5-(x/1.01-800)*0.2=2000
    x-x/1.01*0.01-(x/1.01-800)*0.02=2000
    x-x/1.01*0.01-x/1.01*0.01*0.07*0.5-(x/1.01-800)*0.02=2000
    11537.0666666666t^2+11694.4t-4050=0
    5.0242=（（28.02*0.639（x+0.1））/（1+0.639（x+0.1））*（（100-6.66-1.14）/100）*（1/(1+0.31*1.14）+（（0.76（x+0.1））/（1.3*0.101325））
    33800=(15000*(0.2*1.5*0.9+t*0.8*0.4))
    X+57(X/174)=6930
    X-57(X/174)=6930
    3xx+4((2/3)x+1)^2=12
    1-a/(1.66+a)+1/6.283sin(6.283a/(1.66+a)) = 1/(2*2.325)
    1-a/(1.66+a)+1/6.283sin(6.283a/(1.66+a)) = 1/(2*3.345)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*3.345)
    79.43=（（0.021*x^1.85+48）^0.5）*x^0.84
    14x+0.4x=15
    (X*0.0077)+(X/127.4*42.04)=1700000
    x=1625.6+1625.6*0.03+x*0.03+(1625.6+1625.6*0.03+x*0.03)*0.0475+(1625.6+1625.6*0.03+x*0.03+(1625.6+1625.6*0.03+x*0.03)*0.0475)*0.3+x*0.0524
    x=1226+x*0.03+(1226+x*0.03)*0.0475+(1226+x*0.03+(1226+x*0.03)*0.0475)*0.15+x*0.0524
    ((m+2 sqrt(3))/(m^(2)+sqrt(3) m+2))=((2m+2 sqrt(3))/(m^(2)+2 sqrt(3)m+2))
    （6.66+x）/（6.66-x）*（15+6.09+x）/（0.03+x/222）=20000
    x

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