（4497+650-1102）/4497=x/207
    （4497+650-1102）/4497=x/231
    （4497+650-1102）/4497=x/257
    4497+650-1102/4497=x/257
    4497+650-1102/4497=x/132
    4497+650-1102/4497=x/257
    4497+650-1102/4497=x/257.90112
    arctanx+arctan0.5x=90
    2*e^(-40*x)=e^(-100*x)+1
    2*e^(-40*x)=e^(-100*x)+1
    399=x*0.01+x
    402=x*0.01+x
    741=x*0.01+x
    667.55=x*0.01+x
    0+53*（1+g）/16.2+g=10%
    15678=x*0.01+x
    -0.01*x*x+100
    88.91×0.4+x×0.6＝60
    1.9x÷3=17.1
    30x＝(x+50)10+2000

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