x(72-2x)=650
    x(20-2x)=60
    X=1-8.8%
    X=8.8%-1
    x+(x*0.359)=10000
    4x^2-24x+6=0
    s^2+5/4s+24/16=0
    200.4*x^3-1000*x-480=0
    200.4*x^3+1000*x-480=0
    30*x^3+1000*x-480=0
    x*2500+x*3000/2500*1000=388910
    （4.424-4.424/1.13*0.13+0.11）/7.05=X
    （6.96-6.96/1.13*0.13+0.11）/7.05=X
    （5.15-5.15/1.13*0.13+0.08）/7.05=X
    （8.14-8.14/1.13*0.13+0.12）/7.05=X
    （5.23-5.23/1.13*0.13+0.08）/7.05=X
    （8.26-8.26/1.13*0.13+0.12）/7.05=X
    （8.26-8.26/1.13*0.13+0.08）/7.05=X
    （8.26-8.26/1.13*0.13+0.12）/7.15=X
    （26.448+x）×0.85＝52.895+68.143-x

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