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    300x-x²=300
    6290.3×π×0.0046×(50-x)=125×0.32738×(x-38)
    (1+x)(1000-50x)=10000
    4cos(7x)*cos(13x)*sin(6x)*sin(6x)=sin(25x)*sin(5x)
    2cos(7x)*cos(13x)*sin(6x)*sin(6x)=sin(25x)*sin(5x)
    2cos(7x)*cos(13x)*sin(6x)*sin(6x)=sin(25x)*sin(5x)
    6290.3×π×0.0046×(50-x)=144.36×0.32738×(x-38)
    80000000+53246007X/177535710=0.85X
    367x^2-33.3x+0.48=0
    12x^2-8x-3=0
    3X^(2)-2X-2
    6290.3×π×0.0046×(50-x)=178×0.32738×(x-38)
    6290.3×π×0.0046×(50-x)=199.74×0.32738×(x-38)
    x^2-145x+500=0
    6290.3×π×0.0046×(50-x)=178×0.92738×(x-38)
    6290.3×π×0.0046×(50-x)=199.74×0.92738×(x-38)
    3X^(2)+7X-11=0
    a(0+3)(0-1)=-3
    6+0.5x×400-10减40x等于1170
    arcsin(x/2)+arcsin(x/3)+arcsin(x/4)=π

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