x÷34=27
    9/5x=10
    9/5x=10
    0.5x=6.3
    6X=126
    x÷1.8=18
    x/(1-(1-x)^200)=0.00925
    x/(1-(1-x)^280)=0.00763
    x/(1-(1-x)^380)=0.00452
    x/(1-(1-x)^80)=0.0263
    x*(1-(1-x)^80)=0.0263
     xlnx-18.46x+4883.8=0
    1+2X=36
    1+2X=36
    1+2X=36
    1+2X=36
    1+2X=36
     （x+700）/19*5-4494*0.105=1952.16
     （x+700）/20*5-4494*0.105=1952.16
     （x+700）/21.75*5-4494*0.105=1952.16

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