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
    9y^2-24y+16＝0
    1/3+（lg2）/3=lgx
    9x^5+15x^4+6x^3-8x^2-6x-1=0
    -2133+170x=x/25.32

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