㏒(2,x)=2^-x
    ㏒(10,x)=1/x
    2x^3-4x^2-3x+1=0
    X-X／1.13×0.13=21367521.37
    X-X／1.13×0.13=22321428.57
    X-X／1.13×0.13=23364485.98
    x（x-9）+2=0
    ㏒(0.8,0.2）=x
    ㏒(0.8,0.6）=x
    1/2^x/5730=62.76%
    (1×10^4）^21/14x=10^8
    72×10^8=36×10^8×e^2.1%t
    10^9=5×10^8×e^0.3%t
    3-㏑x=0
    x^3+1.1x^2+0.9x-1.4=0
    (X-180)*(1-25%)/1500=(X-180-320)*(1-25%)/1000
    (X-200-150)*(1-25%)/3300=(X-200)*(1-25%)/3000
    x^9=3^x
    2m*m-3*m-54=0
    2m*m-9*m+14=0

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