40.52=（（0.021*x^1.85+398）^0.5）*x^0.84
    2（x+1)^2+10=6
    3x^3+2x^2+2x+1=0
    x*(x-1)*(x-0.45)
    1.00331X^2+0.0279X-0.0331=0
    （1250-x）22.5*22.5*3.14*7.85+3.14*1/3*7.85*（22.5*22.5+22.5*14+14*14）x = 13.23 /0.000001
     （1250-x）22.5*22.5*3.14*7.85+3.14*1/3*7.85（22.5*22.5+22.5*14+14*14）x = 13.23 /0.000001
    （1250-x）22.5*22.5*3.14*7.85+3.14*1/3*7.85（22.5*22.5+22.5*14+14*14）x=13.23
    abslog（2，X）-1
    233.61 * x^3 - 75.877*x^2 + 4.4278 *x + 0.0022585=0
    x^2-3x-4=0
     （1080-x）*22.5*22.5*3.14*7.85+1/3*3.14x（22.5*22.5+22.5*14+14*14）*7.85 = 11.5/0.000001
    （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

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