x*x*x*x*x=8
     arctan（-5x）+ arctan（-2x）+ arctan（-10x）=3.1415926
     arctan（-5x）+ arctan（-2x）+ arctan（-10x）=-3.1415926
     arctan（-5x）+ arctan（-2x）+ arctan（-10x）=-3.14
    2(5+x)=50+200-2x
    2(5+x)=50+200-62-2x
    2(5+x)=50+200-2x
    2(5+x)=50+200-62-2x
    30.753ln(x) + 6.4138=84.1
    30.753ln(x) + 6.4138=50
    30.753ln(x) + 6.4138=50
    （1+x）∧4=1.26
    31.967ln(x) + 5.6668=84.1
    31.967ln(x) + 5.6668=50
    30.873ln(x) + 5.6328=84.1
    30.873ln(x) + 5.6328=50
    (173.5+364.5)/29*x+145/29*(x+15)+87/29*(x+30)=2130
    18%×x+13%×（1-x）=16%
    （x*4%+x）+（70-x）*40%＝103.6
    17x^5-36x^4+17x^2-36=0

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