(34+x)^2+x^2=50*50
    9638550000=22.4*2350*x*(2102-x*0.5)
    x^3-2x+4
     2607*0.0283（40-x）^0.75 = 40.64*0.844（x-40）*0.3157
    2607*0.0283（40-x）^0.75=40.64*0.844（x-40）
    2x+0.4x=48
    9（x＋1）－6（X－2）＝36
    3（x＋0.8）＝5x
    10.8－1.6（2+x）＝1.2
    （2x＋7）÷3＝11
    （1120.2667-1055.9259）/1055.9259=-1/xln(1-x)-1
    20.5336/1289.5627=-1/xln(1-x）-1
    (1214.3168-1174.9904)/1174.9904=-1/Xln(1-x)-1
    (153+430.5)/31*x+225/31*(x+15)+43/31(x+30)=907
    （2x＋7）÷3＝11
    (1217.8550-1103.948)/1103.948=-1/xln(1-x)-1
    [x^3+1/x^3]/[x+1/x]
    0.0672（2442840+X）=1.06X
    x+1*(6-X)=12
    270/31*x+186/31*(x+15)+93/31(x+30)=1567

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