-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
    10470-x/11486-x=0.53
    1100/x+10000/（x+22.4）+10000/x＝150
    (X-6000*0.06)*0.75/3600=(X-6000*0.06-2400*0.08)*0.75/3000
    （x-6000*0.06）*1.75/3600=(x-6000*0.06-2400*0.08)*0.75/3000

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