x=cosx
    x=tanx
    0.64x = 256
    400(1-X)(1-x) = 256
    25(1+X)(1+x)=36
    （17-X）(12-X)=176
    4(2X+1)(2X+1)-9(2X-1)(2X-1)=0
    3.5913=（（30.56*0.847（x+0.1））/（1+0.847（x+0.1））*（（100-8.28-1.4）/100）*（1/(1+0.31*1.4）+（（2.26（x+0.1））/（1.3*0.101325））
    x²+31x-88=0
    e^（x+1）+e^（-x）-e-1=0
    11560000－6800x+x2=x/5
    11560000－6800x＝1
    13c=（3.3+c）×7.93
    1.4465=（（0.021*x^1.85+398）^0.5）*x^0.84
    0.4465=（（0.021*x^1.85+398）^0.5）*x^0.84
    40.52=（（0.021*x^1.85+398）^0.5）*x^0.84
    2（x+1)^2+10=6
    3x^3+2x^2+2x+1=0
    x*(x-1)*(x-0.45)
    1.00331X^2+0.0279X-0.0331=0

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