(x+40927.84-15000)*0.1-2520=x-20000+927.84
    (x+40927.84)*0.1-2520=x-20000+927.84
    x+(5-x)/(x-2)=2*(x+1)^(1/2)
    401.06x＾2＋1365.79x＋1616.54＝0
    160=-0.0023x^2+1.7786x+5.5427
    120=-0.0023x^2+1.7786x+5.5427
    80=-0.0023x^2+1.7786x+5.5427
    50=-0.0023x^2+1.7786x+5.5427
    50=-0.0023x
    sinx=0.8x
    sinx=0.9x
    sinx=0.95x
    47×a=20.9
    1.5x+（798-x）=1000
    x+(5-x)/(x-2)=2*(x+1)^(1/2)
    2x+x*x+5=0
    x/1.25=3/5
     √m-9=√(m−9)
    450×Q-（310.02+240×Q）-（450Q×13%-15Q-30.4）×12%=0
    √（m）-9=√(m-9)

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