100^-2
    128（1+x)2=608
    （54000x-5.7967）= 3.8-5.7967x
    （54000x-5.7967）= 54000-5.7967x
    54000-5.7967x=
    54000x-x5.7967 =
    54000x-5.7967x =
    54000-5.7967x =
    lg√y＝3
    281.6÷2523.597
    105.9×23.83
    2×140.8
    284.6÷2683.506
    105.9×25.34
    142.3×2
    281.8÷2700.45
    105.9×25.5
    140.9×2
    415.9÷4308.62
    204.2×21.10

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