（26.807+x）×2.15＝53.614+71.721-x
    （26.807+x）×1.95＝53.614+71.721-x
    （26.807+x）×1.75＝53.614+71.721-x
    （26.807+x）×1.55＝53.614+71.721-x
    y^2/（2－y）（4-y）＝9.94
    （e＾x）-1
    （26.807+x）×2.55＝53.614+72.221-x
    （26.807+x）×2.35＝53.614+72.221-x
    （26.807+x）×2.15＝53.614+72.221-x
    （26.807+x）×1.95＝53.614+72.221-x
    （26.807+x）×1.75＝53.614+72.221-x
    （26.807+x）×1.55＝53.614+72.221-x
    (s+2)^3=-8
    (s+2)^3=-1
    X²+34X=72
    （20+X）（14+X）=
    （20+X）（14+X）=
    X²+34X+280-72=0
    144+（a-2）^2＝a^2
    x^2-34x-300

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