600/（1+3%）+600/（1+3%）^2+30600/(1+3%)^3
    2X=93
    s/2.5=27.5%/s-1
    s^2+2.5s-0.6875=0
    tan2a=-1.03
    tan1a=-1.03
    tanb=1.03
    tana=1.03
    tan2a=1.07
    15*cosx/4*sinx+5√3/4=42*sinx*cosx
    42*sinx*cosx=√3/2*cosx+5√3/4
    4x^2+0.00133x-0.0000133=0
    (5.69*10^(-5)-1.242*x)^1.242
    2356622246788753335677888632*34554335543565445654566534667
    100*sqrt(1+0.36*11^2)*sqrt(1+5*11^2)/(x*sqrt(0.25*11^2+1)*sqrt(0.01*11^2+1)sqrt(2401*11^2+1))
    x*(x+2)*(x+4)*(x+6)=3465
    26.7 = X*0.3
     407-200/500-407=X-9.0/20.9-X
    （3/2）-（4/3）
    x+1/x=-17/4

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