x²-20077922x-62431925379
    a＝arctana
    35x-x*x=300
    -3x*x/16+9x/8+3=0
    2a*a-6a+4=0
    (800-y)(1200+0.2y)=854000
    （800-y）(1200+0.2y)=854000
    （800-y）(1200+5y)=854000
    1245.632=195*(1-r^11)/(1-r)-195
    371.7945e^(−0.231x)−228.69e^(−0.1386x)=0
    371.7945e−0.231x−228.69e−0.1386x=0
    (x+2)(x+1)(x-1)＝0
    （4x）+（14.3+x）=57.6
    -x^4
    a √10-3a=6 √10-20
    X+(X/1.01*0.01)+((X+(X/1.01*0.01))-(X+(X/1.01*0.01))*0.2)*0.2=6000
    X+(X/1.01*0.01)+((X+(X/1.01*0.01))-(X+(X/1.01*0.01))*0.2*0.2)=6000
    20-4x=2+6x
    952.875*e^(-0.693*x)-190.575*e^(-0.1386*x)=0
    952.875e^(−0.693x)−190.575e^(−0.1386x)=0

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