-10lg（1-x）=0.4
    （X-800）*0.2=X-2500
    -10lg（1-x）=0.3
    7600/(x+13.44)+10000/(x+22.4)+10000/(x+22.4)=150
    -10lg（1-x）=0.2
    -10lg（1-x）=0.1
    [7y-（210-14+183.36+0+83.2+5+0）]*0.75+183.36=260
    [7y-（210-14+183.36+0+83.2+5+0）]*0.75+183.36=260
    [7y-（210-14+183.36+0+83.2+5+0）]*0.75=260
    [7y-（210-14+183.36+0+83.2+5+0）]*0.75=250
    353.5/31*x+124/31*(x+15)+93/31(x+30)=1184
    400（1+x）（1+x）=676
    0.237sinx+0.01(1+sinx)cos(x-5)=0.193cos(x-5)
    660x+665x=3970
    cosx=0.8283sinx
    1.76=1.76x+x∧2
    427934.67-x=0.1x/1.05*0.05
    (10470-x)/（11486-x） = 0.73
    4x-14=x+10
    (10470-x)/（11486-x ）= 0.53

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