tana=6.4/(7.4+cos(a-5))
    ((9370/81/x)^2)/(2*9.81)+x=14.214
    (9370/81/x)^2/(2*9.81)+x=14.214
    B×B+B=600
    3t+3=6
    x+1
    -2698.304*(1+x)^(-1)-1156.416*(1+x)^(-2)+5292.43032*(1+x)^(-3)+6835.6*(1+x)^(-4)+8793.5*(1+x)^(-5)+8793.5*(1+x)^(-6)+8793.5*(1+x)^(-7)+8793.5*(1+x)^(-8)+8793.5*(1+x)^(-9)+9568.3877*(1+x)^(-10)+9568.3877*(1+x)^(-11)+10098.3*(1+x)^(-12)=0
    2x*x-11x+6=0
    r^2+0.5r+0.5=0
    X-74/X-77＝2/1
    0.74x+x/25*3.6+7.2-x=0
    （X-1100*7200）/X=39.38%
    0.074*sin(x)/cos(x-5) + 0.01*(1+sin(x)) = 0.0482876929917119
    （7500+x-600-5000）/（1-3%）*3%=x
    （7500+x-600-5000）/（1-3%）*3%=x
    u＝tanu
    -x^2+10x+200
    -x^2+10x+200
    (x－1)²＝e
    10＝x²+x+1

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