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    20log(10,x)+10log(10,0.25x^2+1)+10log(10,0.01x^2+1)=8
    (25.3+y)y=700
    (25.3+y)y=7
    x*0.45*2.73*1.81=1.13
    3×x^2-320×x+8200=0
    2sinx*cosx
    15x=(5/11x+10)*11
    15x=(5/11x+10)*11
    15x=(1/15x*5/11+10)*11
    x^2-2x-3=x+1
    15x=(1/15x*5/11+10)*11
    15x=(1/33x+10)*11
    15x=(1/33x+10)*4
    (x/(x+2)-1)/(x^2)/(x^2+4x+4)
    81x^2-45x+4=0
    -2x^2+4x-6
    (2x-1)^2
    (2x-1)^2=x(3x+2)-7
    xx+20x-156=0
    40×30-2xx-2×20x=950

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