e^x=1
    sinxcosx=0.5
    x=(x+1/x)/2
    124.1*1000/200/x+2*194.5*1000*1000/200/x/x+0.5*((2*124.1*1000/200/x+4*194.5*1000000/200/x/x)^2+4*124.1*124.1*1000000/200/200/x/x)^0.5=19.1
    2x÷2.2=4.5
    （X-1）/x＝0.692
    2x十0.5x＝
    X6-4=X8-18
    X6-4=X8-18
    X6-4=X18-8
    Xx6-4=Xx18-8
    0.8b+45+(600-b)=555
    (sqrt(x^2+1)+x)=1/(sqrt(x^2+1)-x)
    arctan(2x)-arctanx=arctan(x/(1+2x^2))
    （1.5－x）÷2＝1.05－x
    49.875=x*0.95-199.5
    6700/（x+11.88)+10000/(x+11.88)+10000/(x+11.88)=150
    6700/（x+11.88)+7500/(x+11.88)+10000/(x+11.88)=150
    6700/（x+11.88)+10000/(x+11.88)+10000/(x+11.88)=150
    2200=x/110*1000

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