sinx+1/sinx
    sinx+1/sinx
    7x^2+4x-4＝0
    3^x = x^9
    3^x = x^9
    n(n+1)/2=300
    （320.1+x）÷x=1.4
    （320.1+x)÷x=1.4
    x^2+15x+38=0
    x^2-12x-13=0
    2.5a^2+1900a-59250
    3x^2+x-4=0
    -x^2-10x-16=0
    4x^2-22x+24=0
    5-lg(1/x)=4.9
    5-lg(1/x)=5
    5+2lgx=4.9
    x*x-108x+288=0
    x2-108x+288=0
    3x²-x-2=0

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