1.95*10^(-3)=(x^2)/((6-2*x)^2)
    1.95*10^(-3)=(x^2)/(6-2*(x^2))
    2d^3+9d^2+12d+8=0
    3x20.5
    3x-8=33+x
    X∧2+X=0.0000177
    X/111-3/44.7-(97-X)/1000=0.286
    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

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