arccos0.9777777777
    x^2-374x+0.01916=0
    cos2x=sinx+cosx
    346800*x^2+0.00264(x-2.5) = 304800x
    346800x^2+0.00264(x-2.5)=304800x
    8000+7200+x=3*（x-400）
    (x+5)/8=(x+6)/7
    x^2+5=0
    0.000007176802613=[1/(500-x)]^2-[1/(800-x)]^2
    0.000001259=(1/(500-x))^2-(1/(800-x))^2
    60*(1-((1/1+x)^10)/x=324.3
    152x*x+633x+3*177=0
    (x-5)(x-17)=4
    －7x^(2)－2x+2＝0
    x^2-22x+81=0
    x+x-35+x+5=180
    0.201752017(x-63407862)58704821=(x-58704821)63407862
    0.201752017*(x-63407862)*58704821=(x-58704821)*63407862
    6.71+129x=8.25+113.48x
    2x=ln(25)

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