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
    （x+1600）*12+2x=12*14000
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.6638)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.6911)
    （31+(20.10−19.12)×18.6+(19.12−h)×19.5）×0.59−2×28×sqrt(0.59)=0
    log2/1X
    117442*（70x^2-2102.5x+5062.5）=444000+10500x
    X/131+16.8/87-40/1333-40/1650=0.00238(X+96.8)

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