x＾1/2
    （1.85（x^0.85））/（2*（7.98）^0.85）=1/0.8
    2*x=6
    1.85x=90
    （180+10x）（50-x）-20（50-x）=10640
    h=28.74*((65+2h)^0.4)/65
    3x^2+（2√26-4+x）^2=（12-2x）^2
    （99666-1.5X）*8.8/20.8*0.9=16802+7X
    （93474-1.5X）*8.8/20.8*0.9=16802+7X
    2685.4645=467*(1-r^11)/(1-r)
    8/(10-x)=6/x
    h = 16.924551*(10+2h)^0.4/10
    h=6.591912*(10+2h)^0.4/10
    h=126/(0.95*(2*9.8*(110.296-h))^0.5)
    h=126/（0.95*（110.296-h）^0.5)
    x/0.09+(1054896.4-x)/0.13=11285068.48
    x/0.09+(1054896.4-x)/0.13=11739645.98
    x/0.09+(174928.17-x)/0.13=1618582.78
    x/0.09+(71925.83-x)/0.13=597402.67
    [(220+260)*29-x]*0.9+16*29=11290.86

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