x×（0.001-x）×（0.0015-2x）²=x×（0.00075-x）×（0.00425-2x）²
    3x*x-x*x*x-12/5*x+2/5=0
    x+2=4
    x^-1.4=0.00044920257967554023716
    a×0.6=7.9
    a×0.6=7.9
    287一15一8一X＝（X一8）÷15
    2X+4×2=24
    2X+4×2=24
    2X*X-2=X
    a×0.6=17.8
    a×0.6=13.8
    a×0.6=8.9
    （1+x）^5=3.9
    x+x*0.0005*175=7374.25
    (1044-35/x)*(1＋x)^48＝1000-35/x
    (1044-35/x)*(1＋x)^48＝1000-35/x
    (1044-35/x)*(1＋x)^48＝1000-35/x
    (1044-35/x)*(1＋x)^48＝1000-35/x
    (1044-35/x)/(1＋x)^48＝1000-35/x

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