（-8+4t）-16
    5t=24-10t
    sin2x/x
    9x^2-27x+216=0
    1*X-5
    ((X*51.323+51.323)/1+1.3*X+1.03)*0.4298+(3.14*X+0.314)/0.1519
    2.53-((X*51.323+51.323)/1+1.3*X+1.03)*0.4298+(3.14*X+0.314)/0.1519
    ((X*51.323+51.323)/1+1.3*X+1.03)*0.4298+(3.14*X+0.314)/0.1519-2.53
    ((X*51.323+51.323)/1+1.3*X+1.03)*0.4298+(3.14*X+0.314)/0.1519
    (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

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