1/(n)^3
    1205.76=(x*cos30)/(0.9*0.594*360)+(x*sin30)/(0.8*0.88*360)
    24260000=14.3*1000*x*(155-x/2)
    （52-X）/（36-X）=3
    x²+0.7x+0.06＝0
    x²+0.7x+0.15＝0
    e^（-1/x）*（1/x）=0.98
    x＾2-x-1=0
    1/√x
    20+(1+0.15*(x/2000)^4)=19(1+5.15*((2000-x)/2000)^4)
    20+(1+0.15*(x/2000)^4)=19(1+3.15*((2000-x)/2000)^4)
    20+(1+0.15*(x/2000)^4)=19(1+2.15*((2000-x)/2000)^4)
    20+(1+0.15*(x/2000)^4)=19(1+1.15*((2000-x)/2000)^4)
    20+(1+0.15*(x/2000)^4)=19(1+0.15*((2000-x)/2000)^4)
    20+(1+0.15*(x/2000)^4)=189(1+0.15*((2000-x)/2000)^4)
    20+(1+0.15*(x/2000)^4)=18+(1+0.15*((2000-x)/2000)^4)
    20+(1+3.15*(x/2000)^4)=22+(1+3.15*((2000-x)/2000)^4)
    20+(1+3.15*(x/2000)^4)=22+(1+1.15*((2000-x)/2000)^4)
    20+(1+3.15*(x/2000)^4)=22+(1+5.15*((2000-x)/2000)^4)
    20+(1+3.15*(x/2000)^4)=23+(1+5.15*((2000-x)/2000)^4)

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