2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*230.6/x*0.35805183739485175)^0.055)=7.7668/x
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*240.1/x*0.35805183739485175)^0.055)=8.825/x
    [(220+260)*28-x]*0.9+18*28=10587.36
    （26.274+x）×0.85＝52.549+67.623-x
    （26.274+x）×0.85＝52.549+68.623-x
    （26.274+x）×0.85＝52.549+69.623-x
    （26.274+x）×0.85＝52.549+70.623-x
    （26.274+x）×0.85＝52.549+71.623-x
    （26.274+x）×0.85＝52.549+72.623-x
    （26.813+x）×0.85＝53.627+74.24-x
    12.13×c=（3.3+c）×8.96
    12.13×c=（3.3+c）×8.97
    x*（X-1）=210
    2/3*((1-1/0.05)+(3/4+1/0.05)*(1/3*215/x*0.35805183739485175)^0.05)=7.611/x
    x-（2/3+1/4）=1/12
    1+x-3/8=9/10
    x+2/7=2/3
    (2d+5)(d+7)(d+1)(d+2)(d+3)8=0
    94(1+x)^140=108
    5000*a=4750

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