280-144x+16x^2=216
    X/1.01*0.01+（1348246.89-X)/1.13*0.13=70404.08
    (X-700)-(X+700)*3/10000-(X-700)*0.13*0.12=0
    32.195=（（0.021*x^1.85+2389）^0.5）*x^0.84
    171=（（0.021*x^1.85+2389）^0.5）*x^0.84
    (1+x)^4=1.39
    36-5x=62-21x
    x^2-(x＋3)＝1
    x∧2-(x＋3)＝1
    x∧2-(x＋3)
    (X-800)-800*0.037/12-(X+800)*3/10000-(X-800)*0.13*0.12=0
    (X-700)-700*0.037/12-(X+700)*3/10000-(X-700)*0.13*0.12=0
    (X-700)-X*0.037/12-(X+700)*3/10000-(X-700)*0.13*0.12=0
    (X-700)-X*0.037/12-(X+700)*6/10000-(X-700)*0.13*0.12=0
    1.28-sqrt(1.5^2-x^2)=sqrt(0.6^2-(1.3-x)^2)
    1811/1766=731/X
    X-1410-41963.18=216865.89
    X*0.2-41963.18=216865.89
    X*0.2-1410-X=216865.89
    (198.5+217)/31*x+279/31*(x+15)+124/31(x+30)=1918

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