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    (1+k^2)×(9.9/5.1)^2=1-k
    (1+k^2)×(51.1/5.1)^2=(k-1)^2
    (9.9/5.1)×(1+k^2)=(1-k)^2
    (X+20.16)/(X+20.16+21432)=0.15
    (1+k^2-2k)×(9.9/5.1)^2=(1-k)^2
    x^2+1=3
    -78+80.4/(1+X/12*2)+3.6/(1+X/12*24)=0
    -78+84/(1+X/12*2)=0
    30x+50(100-x)=3500
    x=((1+20%)-(1-20%))÷(1-20%)
    x^2+5x-2250
    x+4=0
    【16*(2^1/2)-7】x^2+【24*(2^1/2)-7】x+9*(2^1/2)=0
    (4x+30)/2-2=(45-100x)/30
    3x^2+24x+20=0
    84/(1+X/12*2)=78
    92x+80×(72-x)=85×72
    x^2-1130x+512000000=0
    x/0.03-x=14800
    29.5-20lg(w)-10lg(1+w*w/64)-10lg(1+w*w/10000)=0

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