14400=150xxx8
    x^（-1）-1
    -x＾2+4x
    －0.08×(x－4)²+2=0
    x^3+3x+10=0
    4*a^2-4*a+1=0
    1/x＝lnx
    log(x,x)=x
    sqrtx-2x-1=0
    x^2-x-870=0
    5×4+2x=2
    4^x
    x=10-4x
    360/x=495/x+3
    78x^2-190x-280=0
    718x^2-270x-280=0
    718^2-270x-280=0
    (80-x+10)÷3+x÷4×6=100
    (80-x+10)÷3+x÷4×6=100
    1/(2^x)

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