X/（4000+X）=60%
    98219.55-9455.59*1.12-237725.06*0.0006=X
    （10+x）（500-20x）=6000
    （10+x）（500-20x）
    sqrt(((373000)/(10*x))^2+3*((364000*3*x)/(2*10))^2)=1.1*215
    sqrt(((364000)/(2*0.7*8*x*1.22))^2+((273000)/(2*0.7*8*x))^2)=160
    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)

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