log(4，24)-log(4，6)
    ln√e
    log(√7，49)
    log(2，4)
    30*28/44
    154/tan(72)
    154/sin(72)
    (9999−2024)2
    （9999-2118）2
    0.6*85075*（298-8.76）/1000-0.041*17724*4*0.75*0.125*16
    5.261+8.731-5.916=
    2.818+7.256-4.813=
    1.222+4.886-3.290=
    0.342+2.953-2.073=
    -4.437+6.388-8.731=
    -2.355+5.174-7.256=
    -1.032+3.563-4.886=
    -0.282+2.203-2.953=
    2700/(45*5)
    18*5*30

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