arctan0.1wc+arctan0.2wc＝20
    b^4+4b^3+2b^2-4b-2=0
    （x-0.966）*1000-0.1=2
    （x-0.966）*1000-0.1=3
    （x-1.358）*200-0.1=5
    （x-1.358）*200-0.1=4
    x^（9/x）=3
    x^（1/x）=3
    0.0001x^6+0.0201x^4+1.02x^2-99=0
    2x+5x(30-x)=99
    x*0.48+x=840
    x/(1000+x)=10%
    x/1000+x=10%
    x*0.4+x=840
    fact(0)
    14x^63+52x-36
    936.99963214x^5-45x^4+369.8521x^3-6x^2+968555.999x-14
    a(285a+1)(0.25a+1)(0.2a+1)+30(10a+1)=0
    x*143.32/74.55+(0.2841-x)*143.32/58.44=0.6057
    （0.00005-x）*（0.00045-1.705x）²=（0.000125-x）*（0.000375-1.705x）²

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