0.7X+0.7X×6÷4×1.2=527602
    (25-X)*(-500X+20000)=0
    3.14/(sqrt(1-(0.78)^2)x)=1
    e(-3.14*x/(sqrt(1-x^2)))=0.02
    (2*x+0.466)*1.5+2*1.803*(x*(x+0.466))^0.5=1.2
    (2*x+0.466)*1+2*1.414*(x*(x+0.466))^0.5=1.2
    (2*x+0.466)*0.75+2*1.235*(x*(x+0.466))^0.5=1.2
    (2*x+0.466)*0.5+2*1.118*(x*(x+0.466))^0.5=1.2
    （2*x+0.466）*0.25+2*1.031*(x*(x+0.466))^0.5=1.2
    （22806.83-X/1.01*0.01)*1.12=273535.58-X
    （22806.83-X/1.01*0.01)*1.12=273525.58-X
    （22108.15-X/1.01*0.01)*1.12=273525.58-X
     X/(X+2*7200*2259)=4.5%
    X/(x+7200*2259)=4.5%
    6x²-169x+1014=0
    9%=（0.6*（1+4%））/x+4%
    9%=（0.6*（1+4%））/x+4%
    （1+4x）×（2+x）＝36
    x*2=6
    (ex-e-x)/2

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