-arctan(x)-arctan(2x)-arctan(3x)=-180
    2S×S×S＋22S×S＋80S＋64＝0
    —0.8327x—0.0042=—0.4523x+0.6688
    1.7851x+21.89=—0.4523x+0.6688
    arctan(0.1x)+arctan(0.5x)=90
    3.2616*x^2+0.6815432x-0.6815432
    2*(3+x)=19
    7x+2=30
    225x=373x
    x^21-35.71145*x+34.71145=0
    50x^2-31.36x+0.72＝0
    0.01-0.2x=0.007x^1.13
    111132r^3-0.5859r-4.7742*10^(-10)=0
    lnX＝2-X
    x^150+x^100=0
    1/x+1/(x+1)+1/(x+2)=0
    16200*x^2-19584*x+9216=0
    (1+x^2)*(8100*x^4-4*(16-9*x^2)*(225*x^-144))/(16-9*x^2)^2=256
    （2-x）×（6-x）×（18-x）-48-4×（6-x）-4×（18-x）-36×（2-x）＝0
    4*x-e^x=0

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