8x+70%(x-10)=164
    90%(30%x+20%(200-x)+200)-200=27.7
    30%x+20%(200-x)
    30%x=111
    in3.7
    （0.9495x-2877.43）/1.01x=0.3
    0.9495x/1.01x=0.3
    ln(1+1/x)*(1+x)=2/3
    81x^4-x^2=24
    90/5x-90/6x=12/60
    90/5x-90/x=12/60
    x（3.5095-1.5x）＝0.957
    1/tanx
    y = -0.006ln(3000) + 0.1077
    y = -0.006ln(100000000) + 0.1077
    y = -0.006ln(100000) + 0.1077
    100000 = -0.006ln(x) + 0.1077
    30*(t-10）/60-20*（t+12）/60
    30*(t-10）/60-20*（t-10）/60
    arctan （-x）+arctan （2x/3）=90

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