（0.000390445-x）*（0.000109555-2*x）*（0.000109555-2*x）=（0.00051733-x）*（0.00048267-2*x）*（0.00048267-2*x）
    14.3×300×（523-355+0.5×X）×X=360×1017×523-360×402×213
    2145×X×X＋720720×X＋160655400＝0
    arctanx+arctan0.1x+arctan0.47x=π/2
    x^2+x-100=0
    1026402120＝1761903000×x×（1-0.5×x）+93452400
    X-20=X/5
    log2(4^x-8)
    9*n+n*(n-1)/2*9+n*(9+n*9)+n*(n-1)/2*9+n*(9+2*n*9)+n*(n-1)/2*9=3402
    9*n+n*(n-1)/2*9+n*(9+(n-1)*9)+n*(n-1)/2*9+n*(9+(2*n-1)*9)+n*(n-1)/2*9=3402
    4*r*r+3.6r+1.8=0
    y*y-11y=12
    y*y-7y-10=0
    99-x/4=75
    x*exp(-x)
    2x^3+11x^2+20x+8=0
    x^2-x-1=0
    x^2-x+1=0
    x（x＋2）＝3x＋6
    -90-arctanx/20-arctanx/2=-180

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