20x/(2.2*(1+0.01*2.2^2))=1
    90-2arctan(0.1x)=65
    3.14/(x*sqrt(0.75))=1
    e^(-3.14x/(sqrt(1-x^2)))=0.163
    X-X/1.05*0.05-X/1.05*0.05*0.12 = 1500
    X-X*0.05-X*0.05*0.12=1500
    X-X*0.05+X*0.05*0.12=1500
    0.1×[1-（1.4%）^x÷（1-1.4%）]=100000
    100-100（1.4%）^n=98600000
    178.890625=A*(5^2-A^2)^0.5
    x=(0.01x+220)*45
    （2x+1）/x
    x（x^2-0.832x+0.08704）=0
     70877=x*(530-x/2)
    x*(lnx-1)=1
    （x^2+1）（9x^2+1）（0.02x^2+1）=81
    πx/√(1-x²)=2ln2
    6/x－8/（1-2x）－2/（1-x）＝0
    x*1.06=104600+21745.81+x*1.06/10+x*0.06
    x=104600+21745.81+0.1*x+0.06*x*0.94

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