x-tanx
    0.101*(1-exp(-1.1*x))*44.6*1000*3.14*x*x/4 = 17.89
    0.101*(1-exp(-1.1*x))*44.6*1000*3.14*x*x/4 = 8.94
    3-2(c-3)=3(2c-5)
    0.101*(1-exp(-1.1*x))*44.6*1000*3.14*x*x/4 = 8.44
    0.101*(1-exp(-1.1*x))*44.6*1000*3.14*x*x/4 = 17.89
    x*x*x*x-4x*x*x+2x*x-4x+1＝0
    15x^2+96x+89=0
    2(b-3)-6=3(1-b)
    x²+0.0536x-0.00536
    x3-14x^2+17x-196=0
    sin23.5×sin5.5+cos23.5×cos5.5×cos60=sinx
    0.5z-0.2z=3(2-0.1z)
    lne^x^2
    2／3x-2-（2-x）＝x
    0.101*(1-exp(-1.1*0.08))*44.6*1000*0.0072 = x
    2／3x-2-（2-x）＝x
    115*1.5*(0.63*(x-0.43)-0.63*0.63/2)*(1+0.06x)=90*(2.1-x-0.5)*(1-0.1x+0.25)
    23*s^3+45*s+36=0
    6+7m=3+9m-2-3m

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