(39.480×1.3(X+0.1))/(1+1.3×(X+0.1))×0.8117×0.529+(3.14156×(X+0.1))/1.5*0.101325-2.53
    6X∧2-3÷2=0
    （39.480*1.3（X+0.1））/（1+1.3(X+0.1)）*0.8117*0.529+（3.14156*（X+0.1））/1.5*0.101325-2.53
    x/60-1/40= ln(90-x)/(120-x)
    2X∧2+2X-1.5
    2X∧2+2X-3÷2
    2X∧2+2X-3÷2
    8^log(2，a)=343
    4^log(2，a)=2
    [(6+4*3^0.5)/(7+4*3^0.5)]*t^(-1)+t-3^0.5=0
    log(2，a)=16
    log(2，a)=7
    log(2，a^8+a^4+1)=11
    xtanx＝6
    1/(1-1/x)等于
    a^2-1/1.8*10^(-10)a-2*4.96/1.8*10^(-21)=0
    {2-2e-[2k^3+2k^(2)-2k*e+2k]/(3k-2)+2k^2+2k}{[2k^3+2k^(2)-2k*e+2k]/(3k-2)}=4e
    log(2，a^8+a^4+1)=7
    3x²－25x＋24＝0
    x²＋180x－13500

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