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    X^2-17x+2460=0
    X^2-17x+2640=0
    a+a*0.15=1500
    a+a*0.15=3000
    a+a×0.15=2000
    t÷(t^2+4)
    2X*X=128
    x∧4
    115=0.81x
    1.6*10^-19*x*4*11.7*8.85*10^-14*0.0259*log(x/(1.5*10^-10))=(1.25*10^-8)^2
    1.6*10^-19*x*4*11.7*8.85*10^-14*0.0259*log(x/(1.5*10^-10))=(1.25*10^-8)^2
    1.6*10^-19*x*4*11.7*8.85*10^-14*0.0259*log(x/(1.5*10^-10))=(1.25*10^-8)^2
    1.6*10^-19*x*4*11.7*8.85*10^-14*0.0259*log(x/(1.5*10^-10))=(1.25*10^-8)^2
    X²²
    xx=-1
    xxxx+x=4
    x4+x=4
    ex=x+1 lnx=x-1 ex=lnx-2
    7.31x-6.31/x=68
    (9-y)+y+7=16

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