109.1/4.52x=168
    109.1/4.52x
    150/0.65/250=4/22+1/(22x)+6/(13x)+3/(4x)+6/(5.5x)
    250=0.8*0.4^2/(1.05^2*X^2)*521.5/(0.25*3.14*0.4^2)+0.9*(1-0.4^2/(1.05^2*X^2))*100
    x^3+8x^2+18x+16＝0
    x^3+8x^2+18x+16＝0
    x^3+8x^2+18x+16＝0
    ((1+(1+0.2x^2)/(7x^2-1))^3.5)(1+2.8/2.4(x^2-1))=11.3
    ((1+(1+0.2x^2)/(7x^2-1))^3.5)/(1+0.2x^2)^3.5=11.3
    ((1+7/6x^2)(1+(1+0.2x^2)/(7x^2-1))^3.5)/(1+0.2x^2)^3.5=e^(-199.5/287)
    ((1+7/6x)(1+(1+0.2x)/(7x-1))^3.5)/(1+0.2x)^3.5=e^(-199.5/287)
    ((1+7/6x)(1+(1+0.2x)/(7x-1))^3.5)/(1+0.2x)^3.5
    (2393+x)÷(4126+x)=0.6
    (108+x)÷(200+x)=0.6
    x^2+4.5x+10=0
    100x^2+20x-19=0
    x^4-34x^2-300=0
    x^4-70x^2+3=0
    x^4-12x^3-70x^2+101x+3=0
    3x^4+36x^3+178x^2+420x+300=0

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