180/x-2/3=1+(180-x)/1.5/x
    4.5x减0.6x等于0.78
    1500*88%+X=(1500+X)*92%
    1500*88%+X=(1500+X)*92%
    -0.5A^2+4A-6=0
    x×x×x×x×x-x×x×x×x-x+1=0
    0.5A^2+4A-6=0
    8A^2+6A-9=0
    8A^A+6A-9=0
    -1/6x^2+2/3x+1=1.64
    1/6x^2+2/3x+1=1.64
    76k^2-9k-18=0
    x²+2x+1＝0
    2/3x-2=4/3(5/3x-2)^2-8/3(5/3x-2)-4
    1+x=7
    x^2+4.4*10^(-7)x-4.4*10^(-7)=0
    2/3 × t ^2=60+12t
    (x-3)/5-(x+4)/2＝-44
    (x-3)/5-(x+4)/2＝-44
    10x²-12x+3=0

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