7x－1.6x＝16.2
    -3x^2-18x+81=0
    1.5x-3=3(x-4)
    (x-165-250)*13=1000
    1/x+cosx=0
    1/x+cosx=0
    1/x+cosx=0
    90%X-80=75%X+70
    90%X-70%X=120
    90%X-80=70%X+40
    1 * x ^ -2 + 4 * ( -1 * x + 9 ) ^ -2
    Ded
    X- 0.38+0.62=5
    X- 0.38+0.62=5
    acrtant0.001
    0.6x-0.09549sin（πx）+0.27x-0.1125 = 0.2122(sin（πx）^3)+0.0409sin（πx）+0.0409sin（π（1.25-2x））
    0.35*{（x-sin（2πx）/2π）+（3x-1.25）*0.13}＝2/3*{（sin(πx）)^3/π}+0.13*464/550*{sin(πx)+sin(1.25π-2πx）}/π
    X-50-0.2X=183
    X-50-0.2X=1530
    x²+4x+29=0

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