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
    j=0
    a²-4a=0
    2x²+3x+4=0
    16a^4-140a^3+529a^2-956a+760=0
    16b^4-140b^3+529b^2-956b+760=0
    750x/1+x-30x
    x^2+2x+3＝0
    ㏒e（a）=－a－1

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