2√3/3x=3
    4*386.98-15*9.82
    1.15（0.85-x）（0.85-x）=x
    x*x-9=0
    cos45×4
    4*108.5964*x*x*x*x*x*x+112.5764*x*x*x*x+x*x=40000
    x*[1-(1/1.07)^4]*(1/1.07)^4+9.82*[1-(1/1.07)]^5=70
    [1-(1/1.08)^20]/0.08
    36x^2-214x+289=0
    -100x^2+100x-106.625=0
    x(x+3/4)=1
    100x^2+100x-106.625=0
    x^2-0.771x+0.225=0
    48126.91*(1-(1+r)^-5)/r=200000
    x^2+0.771x+0.225=0
    25x^4+20x^3+4X^2-8x=1
    0.025*1000*（1-x）/0.02+1000*x=1136.78
    x^3+14*x^2+90*x+100=0
    -4082750+3000000-450000+X-X*0.25=300000
    (5046+X)/(6080+X) = 0.94

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