(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
    381.15e^(−0.231x)−228.69e^(−0.1386x)=0
    −88.04565e^(−0.231x)+31.696434e^(−0.1386x)=0
    tan（x/2）=1.54/2/0.85
    x/(x+130)=0.78
    7x*x-6x=12
    x*x*x-2=0
    sinx=1+x
    （x-1/x）^2=3996
    56+x=97
    x^2-35x-2750=0
    x^2-35x-750=0

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