11200000=10000*（18000-x）-50000000
    1120=10000*（18000-x）-5000
    0=3x*x-15x-125
    （61919-1.1X）*10.4/22.4*0.9=8.8X
    x^2-126x+2205=0
    6x=9
    3x=9
    5x-10=0
    ex²sinx
    2*sprt((25*12)^2-120^2)/2
    (-2*(m+1))^2+12=0
    test AND 1=2
    test AND 1=1
    test
    387*x-x^2=29806
    4/3*3.14*x^3*(28+x)*7.82=25806
    4/3*3.14*x^3*(28+x)=25806
    15/4*x=3*sqrt(5)/2
    -2/9(11-n)^2+3=1
    -2/9(6-n)^2+3=1

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