1200/x=800/x-1*1.25
    2=x*sin(x)-2cos(x)
    100000=2021x^0.4+9.1426x
    3x^3+133x-588=0
    x(x+1)=1
    4a^(2)=（1-a）0.00959
    x=1.9×0.801×174.344/200000×(1.9×30+0.08×40/0.0251)
    x=1.9×0.801×174.344/200000×(1.9×65+0.08×40/0.0251)
    -lnx=2
    120000/x－100000/x－1=1000
    x=1.1-0.65×2.01/(0.0251×174.34)
    x=(1113.05×10^6)/(0.87×730×10052.8)
    -90-arctan(x*0.469762713)-x*0.005/2=-114.470
    x=1.9×0.723×215.97/200000×(1.9×30+0.08×32/0.0161)
    x=1.9×0.723×215.97/200000×(1.9×65+0.08×32/0.0161)
    x=1.1-0.65×2.01/(0.0161×215..97)
    x=(882.44×10^6)/(0.87×730×6433.6)
    4x=36
    54÷x=6
    X－3×（x－1）

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