（x-4）＾2/7x＾2-8x+8=6/49
    tanx *tan(90-x)
    4x^2+17x=0
    X-5=xx
    tanx=sin70/(1－cos70)
    (8-2X)(6-X)=30
    (2t-26)(2t-26)+144=(16-t)(16-t)
    (16-2t）(16-2t)+144 = (16-t)(16-t)
    （16-2t）(16-2t)+144=(16-2t)(16-2t)
    4.07/x*(76+320000/x)=0.2
    4.07/x*(76+320000/x)=0.2
    2.7*0.6029*500000/200000/x*(1.9*40+0.08*25*400*400/x)=0.2
    2.7*0.6029*500000/(200000*x)*(1.9*40+0.08*25*400*400/x)=0.2
    0.0184*x^2-0.0831*x+1.4246=1.4212
    -0.0614*x^2+0.0895*x+1.3304=1.364
    -0.0614*x^2+0.0895*x+1.3304=1.363
    -0.0614*x^2+0.0895*x+1.3304=1.365
    -0.0614*x^2+0.0895*x+1.3304=1.3665
    2.7*0.6029*500000/(200000*x)*(1.9*40+0.08*25*x/400/400)=0.2
    -0.0614*x^2+0.0895*x+1.3304=1.3670

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