x（0.1x+1）（x+1）+20＝0
    -781x+4021=-5.9x+1686.5
    x+2=3
    x^3=3
    81-40.5-x*(9+x)/2-(9-x)*x/2=13.5
    81-40.5-x*(9+x)/2-(9-x)*x/2=13.5
    （x-1）（2x+3）=2x+3
    （x-40）（740-10x）=2640
    x+1=2
    7x+5.3=7.4
    X-（0.8X*20%）=X
    0.8X*20%=
    （ln0.08）/pi
    4=√2h÷√9.8
    4=√2h÷9.8
    4×x^4+120×x^3+98769×x^2-2697930×x+18510525=0
    x^3+5×x+1=0
    300x=1800÷x+2
    x÷(x+591.02)=0.15
    x-arctanx=0

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