3=5x/(1+x)
    (3x-900)÷600-x÷250=0
    -0.302=17.269x/(237.3+x)
    (3x-900)-x÷250=0
    6x^(2)-11x-x^(3)=10
    5x=3
    （3x-900）÷600-x÷250=0
    470-2x=980-5x
    a^2+a^2=16
    12320*x^2-9979200x+722.23*10^6=0
    lg36
    lg4×lg9
    lne^(3)
    12320x^2-9979200x+722.23*10^6=0
    -5/4x^2+15/4x=1/2x+1
    12320x*x-9979200x+722.23*10^6=0
    15*101.85-4*225.38
    (1000-101.85*(1-1.07^-5)/0.07)/(((1-1.07^-4)/0.07)*1.07^-4)
    (x*((1-1.07^-4)/0.07)*1.07^-4)+(101.85*(1-1.07^-5)/0.07)=1000
    0.897*(7.916*x+8.944*x^3)=156

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