a×0.6=20.9
    a×0.6=59.9
    a×0.6=52.9
    a×0.6=45.9
    a×0.6=38.9
    a×0.6=30.9
    （x-10）（-2x+60）=192
    9x²-71x+144＝0
    logx=0.467
    12489.9x^5-10x=0.9
    12744.8X^5-6X=0.9
    12489.9X^5-6X=0.9
    （x-3）²+81=x²
    x²+4²=（3x-4）²
    （x-3）²+36=x²
    x（5-x）=5
    x（30-3x）=63
    0=-0.5(x-4)^2+12
    tan(x)=x
    X^5-0.00565X-0.001863=0

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