20000/x+50000/(x+60)=250
    20000/x+40000/(x+60)=250
    20000/x+30000/(x+60)=250
    10000/x+20000/(x+60)=150
    8000/(1.5+x)＝5000/x
    4 x-X/1
    116/T=1.5lnT-9.2
    96+3x=138+4x
    96+3x=138-4x
    96+3x=128+4x
    1.5x-0.5+(5x-1)/3=2
    （2x-1）/3=1-0.5x+1
    x-1/3＝1-2/3×x+1/6
    4*x^4+32*x^3+12*x^2+16*x-1=0
    4x^4+32x^3+12x^2+16x-1=0
    (3x-9)x=-12x
    x=7
    （(4226.11+65.73-X-6139.93)/6139.93)*0.5=((1668.51+64.99+X)-3716.13)/3716.13
    （32+x）*3-（32-x）*4=10
    cosx=0.46

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