x/x+1
    1/x2-x
    （100 + X）/（100 + X/0.95）=0.95
    600*x^4-550*x^3+200*x^2-20*x-1=0
    16×n^12+20×n^11+20×n^10+20×n^9+20×n^8=1204166
    16×n^10+20×n^9+20×n^8+20×n^7+20×n^6=1131102
    18×n^10+20×n^9+20×n^8=712895
    ln(1+x)
    X+2／1
    X*0.8-X/124465503*24893100.6=27686102.48
    X=(10000+2000)*5/4
    x*ln(x)+ln2/2*x=0.2974
    x*ln(x)+ln2*x=0.2974
    30÷(t÷368365.1+e(0.0315×t)÷25.86)+ 905.1×e(-0.0230075×t)- 5172=0
    30/(t/368365.1+e(0.0315*t)/ 25.86)+ 905.1*e(-0.0230075*t)- 5172=0
    0.65*(88+X)=48+19
    30/(t/368365.1+e^(0.0315*t)/ 25.86)+ 905.1*e^(-0.0230075*t)- 5172=0
    4/2333＝（m/342）÷（（（m/342）+（（1000-m）/18））
    1680.9* e^( -0.02527*t)- 5172=0
    0.6*(88+x)=48+x

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