x2-x+2
    1.8-8x/1.2-1.3-3x/1.2=5x-0.4/0.3
    1.2/1.8-8x-0.2/1.3-3x=0.3/5x-0.4
    5x²-8x+4
    60000=45000*x^8
    4x+22.8=50.6
    3-4x=2.5
    2-(-x^2-3x-2)^2=0
    x²-6.3x+9.0＝0
    41=3.5x-8
    300000/（P-600-15）=500
    3.14/(x*sqrt(1-0.6^2))=0.75
    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

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