-100+50/（1+x）+70/(1+x)²＝0
    X^3+3x
    X+1/1
    x²-3x+1=0
    155-6.2x＝（4.447x-111.168）/ln［（305-7.2x）/（150-x）］
    155-6.2x＝（4.447x-111.168）/［（305-7.2x）/（150-x）］
    155-6.2x＝（7.742x-193.555）/ln［（305-7.2x）/（150-x）］
    100-20 √ 3/3x+1/3x^2+x^2=196
    100-20 √ 3/3x+x^2+x^2=196
    （10-√3/3x）^2+x^2=196
    2/3x^2-20 √3/3x-96
    2/3x^2-20 √3/3x-104=0
    x^2=4
    100+2/3x^2-20 √3/3x+x^2=204
    0.05x+3=0.01x+35
    25*2+2(x-2*2)=0.9(25*2+2x)
    20*2+2.5(x-20)+0.3x=74
    (24-8*x)/7=(5*x+3)/13-1
    x^2/（0.01-x）=0.08
    x^2/x=0.08

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