0.008x+7.695x^2=16.45x+3.4965x
    0.008x+7.695x^2=16.45+3.4965x
    0.004+7.695x^2=16.45+3.4965x
    lgx=1.888
    (10^-2+2x)^2＝5.2×10^-9÷x
    （（10^-2+2x）^2）x=5.2×10^-9
    （x-2.428）/1.214＝54.2/x∧2
    x/2=18(x-1/3)(x-1/3)
    900*183/3721-18.75=x^2
    900*183/3721-18.75=x
    900*183/3721-18.75-x^2
    6.5^2+2.5*√3*2.5*√3=x^2
    e^(-xπ/sqrt(1-x^2))=0.25
    2s*s*s+23s*s+84s+147=0
    (313.42-0.928x*42)*(1190000-0.291x*50000) = 12500000*(30.13+0.232x)
    x^3-7×x-2=0
    (313.42-0.928x*42)*(1190000-0.291x*50000)=12500000*30.13
    (313.42-0.928*42x)*(1190000-0.291x*50000)=12500000*30.13
    15x^2-24x-8=0
    (sin2x)-2x+0.4π＝0

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