(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
    （27.776+x）×2.55＝55.552+77.128-x
    （27.776+x）×2.75＝55.552+77.128-x
    （27.776+x）×2.75＝55.552+76.628-x
    （27.776+x）×2.55＝55.552+76.628-x
    500000*(1-4.06%)-5136.7-(500000/1.09*0.09-x/1.09*0.09)*1.12=x
    -4200/x+120=2400/(x-30)
    （3X+2）/4=8
    (x^3+2)/3x
    sin(3.1415926x/2.5)
    X²-1120X+120840=0

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