0=(2*3.14*100*x-1/(2*3.14*x*0.001))
    x^2+147x+72*75+210/0.005=0
    72.27=(2*3.14*100*x-1/(2*3.14*x*0.001))
    72.27^2=(2*3.14*100*x-1/(2*3.14*x*0.001))^2
    （（4000-1000）÷1.13-Y÷1.06-41.41）÷25%÷4000=0.01
    （（4000-1000）÷1.13-Y÷1.06-41.41）÷25%÷4000=1%
    X=（4000-1000）÷1.13×0.13×0.12
    50=0.1X
    2*72.27^2=72.27^2+(2*3.14*100*x-1/(2*3.14*x*0.001))^2
    2*72.27^2=72.27^2+(2*3.14*100*x+1/(2*3.14*x*0.001))^2
    sqrt(2)*72.27=sqrt(72.27^2+(2*3.14*100*x+1/(2*3.14*x*0.001))^2)
    4y+1.5x+ayz=0 4x+2z+axz=0 2y+1.5z+axy=0 yzx=150
    （（4000-1000）÷1.13-Y÷1.06-X）÷25%÷4000=1% X=（4000-1000）÷1.13×0.12 求Y是多少？
    0.07*(8.333/(0.65+H))^2+H-1.295=0
    2x-(20/9)x^2=9/20
    (75+x)x=3.93
    5x=3.5
    6x=270
    2x-(20/9)x^3=9/20
    3.3/(75+x)x=0.84

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