2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*246.9/x*0.35805183739485175)^0.055)=8.3453/x
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*249.2/x*0.35805183739485175)^0.055)=8.7197/x
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*253.3/x*0.35805183739485175)^0.055)=8.825/x
    2/3*((1-1/0.055)+(3/4+1/0.055)*(1/3*253.3/x*0.35805183739485175)^0.055)=83825/x
    x*99.975%-120.467*100.025%=0.5/10
    120x=240(6-x)
    2=1.9136x-22.369
    2=1.6467x-16.854
    2=3.0705x-72.533
    2=1.5412x-27.884
    2.400*(f+f-1.40)+-0.399*(f-1.40+f--5.35)+6.060*(f--5.35+f--1.77)=6*140*195*2/1000
    0.813*(f+f-0.48)+1.341*(f-0.48+f-14.10)+6.060*(f-14.10+f-17.51)=6*140*195*2/1000
    1.603*(f+f-0.94)+0.399*(f-0.94+f-7.59)+6.060*(f-7.59+f-11.05)=6*140*195*2/1000
    x*99.975%-120.467*100.025%=1/10
    x/620=（1000-x）/580+1.4
    （480*63-x）*0.85+18*63=26484.77
    （26.274+x）×1.35＝52.549+70.623-x
    （26.274+x）×1.55＝52.549+70.623-x
    （26.274+x）×1.75＝52.549+70.623-x
    （26.274+x）×1.975＝52.549+70.623-x

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