（1080-x）*22.5*22.5*3.14*7.85+1/3*3.14x（22.5*22.5+22.5*14+14*14）=11.5/0.000001
    （300-5x）（4+x）=1680
    （300-5x）（4+x）
    （X-X/1.13*0.13+0.01688）/7.17=0.077938328
    （X-X/1.13*0.13+0.01688）/7.17=0.07468
    （0.586-0.586/1.13*0.13+0.01688）/7.17=X
    （0.586-0.586/1.13*0.1+0.01688）/7.07=X
    （0.576-0.576/1.13*0.1+0.01688）/7.07=X
    （0.576-0.576/1.13*0.13+0.01688）/7.07=X
    （0.576-0.576/1.13*0.13+0.01688）/7.1688=X
    x^2-18.2x+82.6=0
    x^2-9.5x+18.8=0
    720(x+1)^2=2205
    X－0.2X＝1500
    5*x^2+3=4*x^2+4*x
    114514+X=1919810
    （x-2）*(x+2)=2*x-4
    cos x=0.8674
    1/14+2/7+x=3/7
    44.885=（（0.021*x^1.85+159）^0.5）*x^0.84

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