3.14/(x*sqrt(1-0.6^2))=0.17
    e^(-3.14*x/sqrt(1-x^2))*100=9
    x√(5-4x^2)=1.25
    x√(5-4x^2)
    e^(-3.14*x/sqrt(1-x^2))*100=16.3
    1900Q=900Q+600000
    -1/x^2
    10/(1+x)^3+10/(1+x)^4+10/(1+x)^5+10/(1+x)^6=40
    3362831.86x0.13
    3800000=X+X×0.13
    80—（x-2）÷3＝76
    2^x+2x=-15/4
    6000000=X+(X×0.13)
    sqrt(5)x^2=120
    3（2x-1)=4x+9
    0.5x+3=2x-1
    y=70/y-1
    441558*(x/((1+x)^13-1))=280284.75
    280284.75*(((1+x)13-1)/x)=441558
    280284.75*(((1+x)^13-1)/x)=441558

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