x=(1987.76×10^3)/(0.0298×10^6 )+(260.78×10^6)/(1.15×0.0043×10^9 )
    8/13
    120^3=a^3*(1-((a-20)^4))
    ln(2a)≥2a－1
    x=(1×14.3×800×0.518×825+360×1527-238690)/360
    lna=a－1
    （x-2078.2）/x=0.0099
    （x-2078.2）/x=0.99
    x=(238.69×10^3×1438.25-1×14.3×0.518×825×(825-427.4/2))/(360×(825-65) )
    4x^(2)/(1-x)^(2)=e∧(-6.813)
    x=1+1/(1300((230.64×10^6)/(238.69×10^3 )+30)/815) (10.48/0.9)^2×1
    12.56xx60%=37.68
    (180-x)+10=(90-x)*3
    x^3=11974.9313-2675.776*x
    X＋0.08X＝1168
    （180-X)+10=(90-X)x3
    2x+3×x=77
    x^2-6x+17=0
    x^2-6x+1=0
    x=1.9×0.735×148.66/200000×(1.9×30+0.08×32/0.0241)

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